diff --git a/EstateReportingAPI.BusinessLogic.UnitTests/ReportingDatePolicyTests.cs b/EstateReportingAPI.BusinessLogic.UnitTests/ReportingDatePolicyTests.cs
new file mode 100644
index 0000000..1353396
--- /dev/null
+++ b/EstateReportingAPI.BusinessLogic.UnitTests/ReportingDatePolicyTests.cs
@@ -0,0 +1,52 @@
+using EstateReportingAPI.BusinessLogic;
+using Shouldly;
+
+namespace EstateReportingAPI.BusinessLogic.UnitTests;
+
+public sealed class ReportingDatePolicyTests
+{
+    [Fact]
+    public void Today_UsesEuropeLondonAtUtcMidnightBoundary()
+    {
+        ReportingDatePolicy policy = CreatePolicy(new DateTimeOffset(2026, 10, 25, 0, 30, 0, TimeSpan.Zero));
+
+        policy.Today.ShouldBe(new DateOnly(2026, 10, 25));
+    }
+
+    [Fact]
+    public void GetRange_UsesInclusiveStartAndExclusiveDayAfterEnd()
+    {
+        ReportingDatePolicy policy = CreatePolicy(new DateTimeOffset(2026, 9, 30, 12, 0, 0, TimeSpan.Zero));
+
+        ReportingDateRange range = policy.GetRange(new DateOnly(2026, 9, 1), new DateOnly(2026, 9, 30));
+
+        range.StartInclusive.ShouldBe(new DateTime(2026, 9, 1));
+        range.EndExclusive.ShouldBe(new DateTime(2026, 10, 1));
+    }
+
+    [Fact]
+    public void Today_UsesBritishSummerTimeWhenUtcDateDiffersFromLocalDate()
+    {
+        ReportingDatePolicy policy = CreatePolicy(new DateTimeOffset(2026, 6, 30, 23, 30, 0, TimeSpan.Zero));
+
+        policy.Today.ShouldBe(new DateOnly(2026, 7, 1));
+    }
+
+    [Fact]
+    public void ToDateTimeOffset_AppliesBritishSummerTimeOffset()
+    {
+        ReportingDatePolicy policy = CreatePolicy(new DateTimeOffset(2026, 6, 30, 12, 0, 0, TimeSpan.Zero));
+
+        policy.ToDateTimeOffset(new DateTime(2026, 6, 30, 13, 0, 0)).Offset.ShouldBe(TimeSpan.FromHours(1));
+    }
+
+    private static ReportingDatePolicy CreatePolicy(DateTimeOffset utcNow)
+    {
+        return new ReportingDatePolicy(new FixedTimeProvider(utcNow));
+    }
+
+    private sealed class FixedTimeProvider(DateTimeOffset utcNow) : TimeProvider
+    {
+        public override DateTimeOffset GetUtcNow() => utcNow;
+    }
+}
diff --git a/EstateReportingAPI.BusinessLogic/ReportingDatePolicy.cs b/EstateReportingAPI.BusinessLogic/ReportingDatePolicy.cs
new file mode 100644
index 0000000..7824f5b
--- /dev/null
+++ b/EstateReportingAPI.BusinessLogic/ReportingDatePolicy.cs
@@ -0,0 +1,51 @@
+namespace EstateReportingAPI.BusinessLogic;
+
+public readonly record struct ReportingDateRange(DateTime StartInclusive, DateTime EndExclusive);
+
+public sealed class ReportingDatePolicy
+{
+    private const string IanaTimeZoneId = "Europe/London";
+    private const string WindowsTimeZoneId = "GMT Standard Time";
+
+    private readonly TimeProvider Clock;
+    private readonly TimeZoneInfo TimeZone;
+
+    public ReportingDatePolicy(TimeProvider clock)
+    {
+        Clock = clock ?? throw new ArgumentNullException(nameof(clock));
+        TimeZone = ResolveTimeZone();
+    }
+
+    public DateOnly Today => DateOnly.FromDateTime(LocalNow);
+
+    public DateTime LocalNow => TimeZoneInfo.ConvertTime(Clock.GetUtcNow(), TimeZone).DateTime;
+
+    public DateTimeOffset ToDateTimeOffset(DateTime localDateTime)
+    {
+        DateTime unspecified = DateTime.SpecifyKind(localDateTime, DateTimeKind.Unspecified);
+        return new DateTimeOffset(unspecified, TimeZone.GetUtcOffset(unspecified));
+    }
+
+    public ReportingDateRange GetRange(DateOnly startDate, DateOnly endDate)
+    {
+        if (startDate > endDate)
+            throw new ArgumentException("The start date must be less than or equal to the end date.", nameof(startDate));
+
+        DateTime startInclusive = startDate.ToDateTime(TimeOnly.MinValue, DateTimeKind.Unspecified);
+        DateTime endExclusive = endDate.AddDays(1).ToDateTime(TimeOnly.MinValue, DateTimeKind.Unspecified);
+
+        return new ReportingDateRange(startInclusive, endExclusive);
+    }
+
+    private static TimeZoneInfo ResolveTimeZone()
+    {
+        try
+        {
+            return TimeZoneInfo.FindSystemTimeZoneById(IanaTimeZoneId);
+        }
+        catch (TimeZoneNotFoundException)
+        {
+            return TimeZoneInfo.FindSystemTimeZoneById(WindowsTimeZoneId);
+        }
+    }
+}
diff --git a/EstateReportingAPI.BusinessLogic/Services/EstateReportingService.cs b/EstateReportingAPI.BusinessLogic/Services/EstateReportingService.cs
index 35fe469..dbe6025 100644
--- a/EstateReportingAPI.BusinessLogic/Services/EstateReportingService.cs
+++ b/EstateReportingAPI.BusinessLogic/Services/EstateReportingService.cs
@@ -20,11 +20,13 @@ public interface IEstateReportingService
 public sealed class EstateReportingService : IEstateReportingService
 {
     private readonly IDbContextResolver<EstateManagementContext> Resolver;
+    private readonly ReportingDatePolicy DatePolicy;
     private const string EstateManagementDatabaseName = "TransactionProcessorReadModel";
 
-    public EstateReportingService(IDbContextResolver<EstateManagementContext> resolver)
+    public EstateReportingService(IDbContextResolver<EstateManagementContext> resolver, ReportingDatePolicy? datePolicy = null)
     {
         Resolver = resolver;
+        DatePolicy = datePolicy ?? new ReportingDatePolicy(TimeProvider.System);
     }
 
     public async Task<Result<List<Calendar>>> GetCalendarComparisonDates(CalendarQueries.GetComparisonDatesQuery request,
@@ -32,11 +34,11 @@ public async Task<Result<List<Calendar>>> GetCalendarComparisonDates(CalendarQue
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.EstateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        DateTime today = DateTime.Today;
+        DateTime today = DatePolicy.Today.ToDateTime(TimeOnly.MinValue);
         DateTime startDate = today.AddYears(-1);
         DateTime endDate = today.AddDays(-1); // yesterday
 
-        var result = await ReportingQueryExecutor.ToListAsync(context.Calendar.Where(c => c.Date >= startDate && c.Date < endDate).OrderByDescending(c => c.Date), cancellationToken, "Error retrieving calendar comparison dates");
+        var result = await ReportingQueryExecutor.ToListAsync(context.Calendar.Where(c => c.Date >= startDate && c.Date <= endDate).OrderByDescending(c => c.Date), cancellationToken, "Error retrieving calendar comparison dates");
 
         if (result.IsFailed)
             return ResultHelpers.CreateFailure(result);
@@ -71,7 +73,7 @@ public async Task<Result<List<Calendar>>> GetCalendarDates(CalendarQueries.GetAl
         await using EstateManagementContext context = resolvedContext.Context;
 
 
-        var result = await ReportingQueryExecutor.ToListAsync(context.Calendar.Where(c => c.Date <= DateTime.Now.Date), cancellationToken, "Error retrieving calendar dates");
+        var result = await ReportingQueryExecutor.ToListAsync(context.Calendar.Where(c => c.Date <= DatePolicy.Today.ToDateTime(TimeOnly.MinValue)), cancellationToken, "Error retrieving calendar dates");
 
         if (result.IsFailed)
             return ResultHelpers.CreateFailure(result);
@@ -102,7 +104,7 @@ public async Task<Result<List<Int32>>> GetCalendarYears(CalendarQueries.GetYears
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.EstateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        var result = await ReportingQueryExecutor.ToListAsync(context.Calendar.Where(c => c.Date <= DateTime.Now.Date).GroupBy(c => c.Year).Select(y => y.Key), cancellationToken, "Error retrieving calendar years");
+        var result = await ReportingQueryExecutor.ToListAsync(context.Calendar.Where(c => c.Date <= DatePolicy.Today.ToDateTime(TimeOnly.MinValue)).GroupBy(c => c.Year).Select(y => y.Key), cancellationToken, "Error retrieving calendar years");
 
         if (result.IsFailed)
             return ResultHelpers.CreateFailure(result);
diff --git a/EstateReportingAPI.BusinessLogic/Services/FileImportReportingService.cs b/EstateReportingAPI.BusinessLogic/Services/FileImportReportingService.cs
index b5adc47..cfaca40 100644
--- a/EstateReportingAPI.BusinessLogic/Services/FileImportReportingService.cs
+++ b/EstateReportingAPI.BusinessLogic/Services/FileImportReportingService.cs
@@ -33,7 +33,7 @@ from esu in esuJoin.DefaultIfEmpty()
                         join m in context.Merchants on f.MerchantId equals m.MerchantId into mJoin
                         from m in mJoin.DefaultIfEmpty()
                         join fl in context.FileLines on f.FileId equals fl.FileId
-                        where fil.ImportLogDate >= request.StartDate && fil.ImportLogDate <= request.EndDate
+                        where fil.ImportLogDate >= request.StartDate.Date && fil.ImportLogDate < request.EndDate.Date.AddDays(1)
                               && (request.MerchantId == null || f.MerchantId == request.MerchantId)
                         select new FileImportFlatData {
                             FileImportLogId = fil.FileImportLogId,
diff --git a/EstateReportingAPI.BusinessLogic/Services/MerchantReportingService.cs b/EstateReportingAPI.BusinessLogic/Services/MerchantReportingService.cs
index 1195049..26e75f9 100644
--- a/EstateReportingAPI.BusinessLogic/Services/MerchantReportingService.cs
+++ b/EstateReportingAPI.BusinessLogic/Services/MerchantReportingService.cs
@@ -42,11 +42,13 @@ public interface IMerchantReportingService
 public sealed class MerchantReportingService : IMerchantReportingService
 {
     private readonly IDbContextResolver<EstateManagementContext> Resolver;
+    private readonly ReportingDatePolicy DatePolicy;
     private const string EstateManagementDatabaseName = "TransactionProcessorReadModel";
 
-    public MerchantReportingService(IDbContextResolver<EstateManagementContext> resolver)
+    public MerchantReportingService(IDbContextResolver<EstateManagementContext> resolver, ReportingDatePolicy? datePolicy = null)
     {
         Resolver = resolver;
+        DatePolicy = datePolicy ?? new ReportingDatePolicy(TimeProvider.System);
     }
 
     private static async Task<Result<T>> ExecuteQuerySafeSum<T>(IQueryable query,
@@ -367,7 +369,7 @@ public async Task<Result<MerchantKpi>> GetMerchantsTransactionKpis(MerchantQueri
 
         var merchants = merchantsQueryResult.Data;
 
-        DateTime now = DateTime.Now;
+        DateTime now = DatePolicy.LocalNow;
 
         Int32 merchantsWithSaleInLastHour = (from m in merchants where m.LastSale >= now.AddHours(-1) && m.LastSale <= now select m).Count();
 
diff --git a/EstateReportingAPI.BusinessLogic/Services/SettlementReportingService.cs b/EstateReportingAPI.BusinessLogic/Services/SettlementReportingService.cs
index 62b06c1..498620e 100644
--- a/EstateReportingAPI.BusinessLogic/Services/SettlementReportingService.cs
+++ b/EstateReportingAPI.BusinessLogic/Services/SettlementReportingService.cs
@@ -15,15 +15,20 @@ public interface ISettlementReportingService
 public sealed class SettlementReportingService : ISettlementReportingService
 {
     private readonly IDbContextResolver<EstateManagementContext> Resolver;
+    private readonly ReportingDatePolicy DatePolicy;
     private const string EstateManagementDatabaseName = "TransactionProcessorReadModel";
-    public SettlementReportingService(IDbContextResolver<EstateManagementContext> resolver) => Resolver = resolver;
+    public SettlementReportingService(IDbContextResolver<EstateManagementContext> resolver, ReportingDatePolicy? datePolicy = null)
+    {
+        Resolver = resolver;
+        DatePolicy = datePolicy ?? new ReportingDatePolicy(TimeProvider.System);
+    }
 
     public async Task<Result<TodaysSettlement>> GetTodaysSettlement(SettlementQueries.TodaysSettlementQuery request,
                                                                     CancellationToken cancellationToken) {
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.EstateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        IQueryable<DatabaseProjections.TodaySettlementTransactionProjection> todaySettlementData = this.BuildTodaySettlementQuery(context, DateTime.Now);
+        IQueryable<DatabaseProjections.TodaySettlementTransactionProjection> todaySettlementData = this.BuildTodaySettlementQuery(context, DatePolicy.Today.ToDateTime(TimeOnly.MinValue));
         IQueryable<DatabaseProjections.ComparisonSettlementTransactionProjection> comparisonSettlementData = this.BuildComparisonSettlementQuery(context, request.ComparisonDate);
         
         DatabaseProjections.SettlementGroupProjection todaySettlement = await this.GetSettlementSummary(todaySettlementData, cancellationToken);
@@ -92,4 +97,4 @@ public async Task<Result<TodaysSettlement>> GetTodaysSettlement(SettlementQuerie
             IQueryable<DatabaseProjections.ComparisonSettlementTransactionProjection> settlementData = from s in context.Settlements join f in context.MerchantSettlementFees on s.SettlementId equals f.SettlementId join t in context.TransactionHistory on f.TransactionId equals t.TransactionId where s.SettlementDate == settlementDate.Date select new DatabaseProjections.ComparisonSettlementTransactionProjection { Fee = f, Txn = t };
             return settlementData;
         }
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI.BusinessLogic/Services/TransactionReportingService.cs b/EstateReportingAPI.BusinessLogic/Services/TransactionReportingService.cs
index 864f130..d59db9d 100644
--- a/EstateReportingAPI.BusinessLogic/Services/TransactionReportingService.cs
+++ b/EstateReportingAPI.BusinessLogic/Services/TransactionReportingService.cs
@@ -32,11 +32,13 @@ public interface ITransactionReportingService
 public sealed class TransactionReportingService : ITransactionReportingService
 {
     private readonly IDbContextResolver<EstateManagementContext> Resolver;
+    private readonly ReportingDatePolicy DatePolicy;
     private const string EstateManagementDatabaseName = "TransactionProcessorReadModel";
 
-    public TransactionReportingService(IDbContextResolver<EstateManagementContext> resolver)
+    public TransactionReportingService(IDbContextResolver<EstateManagementContext> resolver, ReportingDatePolicy? datePolicy = null)
     {
         Resolver = resolver;
+        DatePolicy = datePolicy ?? new ReportingDatePolicy(TimeProvider.System);
 }
 
     public async Task<Result<TodaysSales>> GetTodaysFailedSales(TransactionQueries.TodaysFailedSales request,
@@ -44,8 +46,9 @@ public async Task<Result<TodaysSales>> GetTodaysFailedSales(TransactionQueries.T
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.EstateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        IQueryable<Decimal> todaysSalesQuery = this.BuildTodaysFailedSalesQuery(context, request.ResponseCode);
-        IQueryable<Decimal> comparisonSalesQuery = this.BuildComparisonFailedSalesQuery(context, request.ComparisonDate, request.ResponseCode);
+        DateTime now = DatePolicy.LocalNow;
+        IQueryable<Decimal> todaysSalesQuery = this.BuildTodaysFailedSalesQuery(context, request.ResponseCode, now);
+        IQueryable<Decimal> comparisonSalesQuery = this.BuildComparisonFailedSalesQuery(context, request.ComparisonDate, request.ResponseCode, now);
 
         var todaysSalesQueryResult = await ReportingQueryExecutor.ToListAsync(todaysSalesQuery, cancellationToken, "Error retrieving todays failed sales");
         if (todaysSalesQueryResult.IsFailed)
@@ -72,8 +75,9 @@ public async Task<Result<TodaysSales>> GetTodaysSales(TransactionQueries.TodaysS
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.EstateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        IQueryable<TodayTransaction> todaysSales = this.BuildTodaySalesQuery(context);
-        IQueryable<TransactionHistory> comparisonSales = this.BuildComparisonSalesQuery(context, request.ComparisonDate);
+        DateTime now = DatePolicy.LocalNow;
+        IQueryable<TodayTransaction> todaysSales = this.BuildTodaySalesQuery(context, now);
+        IQueryable<TransactionHistory> comparisonSales = this.BuildComparisonSalesQuery(context, request.ComparisonDate, now);
 
         todaysSales = todaysSales.ApplyMerchantFilter(request.MerchantReportingId).ApplyOperatorFilter(request.OperatorReportingId);
         comparisonSales = comparisonSales.ApplyMerchantFilter(request.MerchantReportingId).ApplyOperatorFilter(request.OperatorReportingId);
@@ -145,7 +149,7 @@ from msf in msfJoin.DefaultIfEmpty()
             // left join Settlements (msf may be null)
             join s in context.Settlements on msf.SettlementId equals s.SettlementId into sJoin
             from s in sJoin.DefaultIfEmpty()
-            where t.TransactionType != "Logon" && t.TransactionDate >= request.StartDate && t.TransactionDate <= request.EndDate
+            where t.TransactionType != "Logon" && t.TransactionDate >= request.StartDate.Date && t.TransactionDate < request.EndDate.Date.AddDays(1)
             select new TransactionDetailQueryResult {
                 TransactionId = t.TransactionId,
                 TransactionDateTime = t.TransactionDateTime,
@@ -255,7 +259,7 @@ private static IQueryable<MerchantTransactionGroupProjection> BuildMerchantTrans
         return from t in context.Transactions
             join m in context.Merchants on t.MerchantId equals m.MerchantId
             join o in context.Operators on t.OperatorId equals o.OperatorId
-            where t.TransactionType == "Sale" && t.TransactionDate >= startDate && t.TransactionDate <= endDate
+            where t.TransactionType == "Sale" && t.TransactionDate >= startDate.Date && t.TransactionDate < endDate.Date.AddDays(1)
             group t by new { t.MerchantId, m.MerchantReportingId, MerchantName = m.Name, t.OperatorId, o.OperatorReportingId }
             into g
             select new MerchantTransactionGroupProjection {
@@ -314,7 +318,7 @@ private static IQueryable<OperatorTransactionData> BuildOperatorTransactionBaseQ
         var query = from t in context.Transactions
             join m in context.Merchants on t.MerchantId equals m.MerchantId
             join o in context.Operators on t.OperatorId equals o.OperatorId
-            where t.TransactionType == "Sale" && t.TransactionDate >= request.Request.StartDate && t.TransactionDate <= request.Request.EndDate
+            where t.TransactionType == "Sale" && t.TransactionDate >= request.Request.StartDate.Date && t.TransactionDate < request.Request.EndDate.Date.AddDays(1)
             group t by new {
                 t.MerchantId,
                 m.MerchantReportingId,
@@ -395,7 +399,7 @@ public async Task<Result<ProductPerformanceResponse>> GetProductPerformanceRepor
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.EstateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        var grandTotalAmountQuery = (from t in context.Transactions where t.TransactionType == "Sale" && t.TransactionDate >= request.StartDate && t.TransactionDate <= request.EndDate select t.TransactionAmount);
+        var grandTotalAmountQuery = (from t in context.Transactions where t.TransactionType == "Sale" && t.TransactionDate >= request.StartDate.Date && t.TransactionDate < request.EndDate.Date.AddDays(1) select t.TransactionAmount);
         var grandTotalAmountResult = await ReportingQueryExecutor.SumAsync<decimal>(grandTotalAmountQuery, cancellationToken);
         if (grandTotalAmountResult.IsFailed)
             return ResultHelpers.CreateFailure(grandTotalAmountResult);
@@ -448,8 +452,8 @@ public async Task<Result<TransactionMixSummaryResponse>> GetTransactionMixSummar
         {
             return Result.Success(new TransactionMixSummaryResponse
             {
-                FromDate = request.Request.StartDate,
-                ToDate = request.Request.EndDate,
+                FromDate = DateOnly.FromDateTime(request.Request.StartDate),
+                ToDate = DateOnly.FromDateTime(request.Request.EndDate),
                 Breakdown = request.Request.Breakdown,
                 Measure = request.Request.Measure,
                 TotalCount = 0,
@@ -488,7 +492,7 @@ public async Task<Result<GetRecentActivityReceiptReportResponse>> GetRecentActiv
 
     private static RecentActivityReceiptRequestParameters BuildRecentActivityReceiptRequestParameters(GetRecentActivityReceiptReportRequest request) {
         return new RecentActivityReceiptRequestParameters {
-            ReportDate = request.ReportDate.Date,
+            ReportDate = DateOnly.FromDateTime(request.ReportDate.Date),
             MerchantReportingId = request.MerchantReportingId,
             SearchText = request.SearchText?.Trim(),
             PageNumber = request.PageNumber > 0 ? request.PageNumber : 1,
@@ -502,7 +506,7 @@ private static IQueryable<RecentActivityReceiptQueryResult> BuildRecentActivityR
             join m in context.Merchants on t.MerchantId equals m.MerchantId
             join o in context.Operators on t.OperatorId equals o.OperatorId
             join cp in context.ContractProducts on new { t.ContractProductId, t.ContractId } equals new { cp.ContractProductId, cp.ContractId }
-            where t.TransactionDate == parameters.ReportDate
+            where t.TransactionDate == parameters.ReportDate.ToDateTime(TimeOnly.MinValue)
             select new RecentActivityReceiptQueryResult {
                 TransactionDateTime = t.TransactionDateTime,
                 MerchantReportingId = m.MerchantReportingId,
@@ -577,7 +581,7 @@ private static IQueryable<ProductPerformanceItemData> BuildProductPerformanceQue
         return from t in context.Transactions
             join cp in context.ContractProducts on new { t.ContractProductId, t.ContractId } equals new { cp.ContractProductId, cp.ContractId }
             join c in context.Contracts on t.ContractId equals c.ContractId
-            where t.TransactionType == "Sale" && t.TransactionDate >= startDate && t.TransactionDate <= endDate
+            where t.TransactionType == "Sale" && t.TransactionDate >= startDate.Date && t.TransactionDate < endDate.Date.AddDays(1)
             group t by new { cp.ProductName, cp.ContractProductId, cp.ContractProductReportingId, c.ContractId, c.ContractReportingId }
             into g
             select new ProductPerformanceItemData {
@@ -649,8 +653,8 @@ private static TransactionMixSummaryResponse BuildTransactionMixSummaryResponse(
 
         return new TransactionMixSummaryResponse
         {
-            FromDate = request.StartDate,
-            ToDate = request.EndDate,
+            FromDate = DateOnly.FromDateTime(request.StartDate),
+            ToDate = DateOnly.FromDateTime(request.EndDate),
             Breakdown = request.Breakdown,
             Measure = request.Measure,
             TotalCount = queryResults.Count,
@@ -687,8 +691,9 @@ public async Task<Result<List<TodaysSalesByHour>>> GetTodaysSalesByHour(Transact
         using ResolvedDbContext<EstateManagementContext>? resolvedContext = Resolver.Resolve(EstateManagementDatabaseName, request.estateId.ToString());
         await using EstateManagementContext context = resolvedContext.Context;
 
-        IQueryable<TodayTransaction> todaysSales = this.BuildTodaySalesQuery(context);
-        IQueryable<TransactionHistory> comparisonSales = this.BuildComparisonSalesQuery(context, request.comparisonDate);
+        DateTime now = DatePolicy.LocalNow;
+        IQueryable<TodayTransaction> todaysSales = this.BuildTodaySalesQuery(context, now);
+        IQueryable<TransactionHistory> comparisonSales = this.BuildComparisonSalesQuery(context, request.comparisonDate, now);
 
         // First we need to get a value of todays sales
         var todaysSalesByHourQuery = (from t in todaysSales group t.TransactionAmount by t.Hour into g select new { Hour = g.Key, TotalSalesCount = g.Count(), TotalSalesValue = g.Sum() });
@@ -758,27 +763,30 @@ public async Task<Result<MerchantDailyPerformanceSummaryResponse>> GetMerchantDa
         });
     }
 
-        private IQueryable<TodayTransaction> BuildTodaySalesQuery(EstateManagementContext context) {
-            return from t in context.TodayTransactions where t.IsAuthorised && t.TransactionType == "Sale" && t.TransactionDate == DateTime.Now.Date && t.TransactionTime <= DateTime.Now.TimeOfDay select t;
+        private IQueryable<TodayTransaction> BuildTodaySalesQuery(EstateManagementContext context, DateTime now) {
+             return from t in context.TodayTransactions where t.IsAuthorised && t.TransactionType == "Sale" && t.TransactionDate == now.Date && t.TransactionTime <= now.TimeOfDay select t;
         }
 
         private IQueryable<Decimal> BuildTodaysFailedSalesQuery(EstateManagementContext context,
-                                                                String responseCode) {
+                                                                String responseCode,
+                                                                DateTime now) {
             return from t in context.TodayTransactions
-                   where t.IsAuthorised == false && t.TransactionType == "Sale" && t.ResponseCode == responseCode
+                    where t.IsAuthorised == false && t.TransactionType == "Sale" && t.TransactionDate == now.Date && t.TransactionTime <= now.TimeOfDay && t.ResponseCode == responseCode
                    select t.TransactionAmount;
         }
 
         private IQueryable<TransactionHistory> BuildComparisonSalesQuery(EstateManagementContext context,
-                                                                          DateTime comparisonDate) {
-            return from t in context.TransactionHistory where t.IsAuthorised && t.TransactionType == "Sale" && t.TransactionDate == comparisonDate && t.TransactionTime <= DateTime.Now.TimeOfDay select t;
+                                                                          DateTime comparisonDate,
+                                                                          DateTime now) {
+             return from t in context.TransactionHistory where t.IsAuthorised && t.TransactionType == "Sale" && t.TransactionDate == comparisonDate.Date && t.TransactionTime <= now.TimeOfDay select t;
         }
 
         private IQueryable<Decimal> BuildComparisonFailedSalesQuery(EstateManagementContext context,
                                                                     DateTime comparisonDate,
-                                                                    String responseCode) {
+                                                                    String responseCode,
+                                                                    DateTime now) {
             return from t in context.TransactionHistory
-                   where t.IsAuthorised == false && t.TransactionType == "Sale" && t.TransactionDate == comparisonDate && t.TransactionTime <= DateTime.Now.TimeOfDay && t.ResponseCode == responseCode
+                   where t.IsAuthorised == false && t.TransactionType == "Sale" && t.TransactionDate == comparisonDate.Date && t.TransactionTime <= now.TimeOfDay && t.ResponseCode == responseCode
                    select t.TransactionAmount;
         }
 
@@ -914,7 +922,7 @@ join op in context.Operators on t.OperatorId equals op.OperatorId into opJoin
                 from op in opJoin.DefaultIfEmpty()
                 where t.TransactionType == "Sale"
                       && t.TransactionDate >= startDate
-                      && t.TransactionDate <= endDate
+                      && t.TransactionDate < endDate.Date.AddDays(1)
                       && m.MerchantReportingId == request.Request.MerchantReportingId
                 group t by new
                 {
@@ -950,7 +958,7 @@ join op in context.Operators on t.OperatorId equals op.OperatorId into opJoin
                  from op in opJoin.DefaultIfEmpty()
                  where t.TransactionType == "Sale"
                        && t.TransactionDate >= startDate
-                       && t.TransactionDate <= endDate
+                       && t.TransactionDate < endDate.Date.AddDays(1)
                        && m.MerchantReportingId == request.Request.MerchantReportingId
                  orderby t.TransactionDateTime descending
                  select new MerchantDailyPerformanceRecentSaleProjection
@@ -990,7 +998,7 @@ private sealed class RecentActivityReceiptQueryResult {
         }
 
         private sealed class RecentActivityReceiptRequestParameters {
-            public DateTime ReportDate { get; init; }
+            public DateOnly ReportDate { get; init; }
             public int? MerchantReportingId { get; init; }
             public string? SearchText { get; init; }
             public int PageNumber { get; init; }
diff --git a/EstateReportingAPI.DataTrasferObjects/ComparisonDate.cs b/EstateReportingAPI.DataTrasferObjects/ComparisonDate.cs
index 3de80f1..e0de881 100644
--- a/EstateReportingAPI.DataTrasferObjects/ComparisonDate.cs
+++ b/EstateReportingAPI.DataTrasferObjects/ComparisonDate.cs
@@ -3,7 +3,7 @@
 
     public class ComparisonDate{
         public Int32 OrderValue{ get; set; }
-        public DateTime Date { get; set; }
+        public DateOnly Date { get; set; }
         public String Description { get; set; }
     }
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI.DataTrasferObjects/FileDetails.cs b/EstateReportingAPI.DataTrasferObjects/FileDetails.cs
index 364e637..551735e 100644
--- a/EstateReportingAPI.DataTrasferObjects/FileDetails.cs
+++ b/EstateReportingAPI.DataTrasferObjects/FileDetails.cs
@@ -8,10 +8,10 @@ public class FileDetails
     public Guid FileId { get; set; }
     public string FileName { get; set; }
     public string FileProfile { get; set; }
-    public DateTime DateTimeUploaded { get; set; }
+    public DateTimeOffset DateTimeUploaded { get; set; }
     public Guid UserId { get; set; }
     public string UploadedBy { get; set; }
     public Guid MerchantId { get; set; }
     public string MerchantName { get; set; }
     public List<FileLine> FileLines { get; set; } = new List<FileLine>();
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI.DataTrasferObjects/FileImportLog.cs b/EstateReportingAPI.DataTrasferObjects/FileImportLog.cs
index a4eb3c0..dceb309 100644
--- a/EstateReportingAPI.DataTrasferObjects/FileImportLog.cs
+++ b/EstateReportingAPI.DataTrasferObjects/FileImportLog.cs
@@ -6,6 +6,6 @@ namespace EstateReportingAPI.DataTransferObjects;
 public class FileImportLog
 {
     public Guid FileImportLogId { get; set; }
-    public DateTime ImportLogDateTime { get; set; }
+    public DateTimeOffset ImportLogDateTime { get; set; }
     public List<FileDetails> FileDetailsList { get; set; }
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportRequest.cs b/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportRequest.cs
index b2ee95b..cca821c 100644
--- a/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportRequest.cs
+++ b/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportRequest.cs
@@ -4,7 +4,7 @@ namespace EstateReportingAPI.DataTransferObjects;
 
 public class GetRecentActivityReceiptReportRequest
 {
-    public DateTime ReportDate { get; set; }
+    public DateOnly ReportDate { get; set; }
     public int? MerchantReportingId { get; set; }
     public string? SearchText { get; set; }
     public int PageNumber { get; set; } = 1;
diff --git a/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportResponse.cs b/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportResponse.cs
index 48ededc..87678c7 100644
--- a/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportResponse.cs
+++ b/EstateReportingAPI.DataTrasferObjects/GetRecentActivityReceiptReportResponse.cs
@@ -5,7 +5,7 @@ namespace EstateReportingAPI.DataTransferObjects;
 
 public class GetRecentActivityReceiptReportResponse
 {
-    public DateTime ReportDate { get; set; }
+    public DateOnly ReportDate { get; set; }
     public int PageNumber { get; set; }
     public int PageSize { get; set; }
     public int TotalCount { get; set; }
@@ -20,6 +20,6 @@ public class RecentActivityReceiptItemDto
     public string? Operator { get; set; }
     public string? Status { get; set; }
     public decimal Amount { get; set; }
-    public DateTime TransactionDateTime { get; set; }
+    public DateTimeOffset TransactionDateTime { get; set; }
     public string? ReceiptReference { get; set; }
 }
diff --git a/EstateReportingAPI.DataTrasferObjects/MerchantDailyPerformanceSummaryRequest.cs b/EstateReportingAPI.DataTrasferObjects/MerchantDailyPerformanceSummaryRequest.cs
index 2cbdbab..c5ab6d0 100644
--- a/EstateReportingAPI.DataTrasferObjects/MerchantDailyPerformanceSummaryRequest.cs
+++ b/EstateReportingAPI.DataTrasferObjects/MerchantDailyPerformanceSummaryRequest.cs
@@ -7,8 +7,8 @@ namespace EstateReportingAPI.DataTransferObjects
     public class MerchantDailyPerformanceSummaryRequest
     {
         public Int32 MerchantReportingId { get; set; }
-        public DateTime StartDate { get; set; }
-        public DateTime EndDate { get; set; }
+        public DateOnly StartDate { get; set; }
+        public DateOnly EndDate { get; set; }
     }
 
     public sealed class MerchantDailyPerformanceSummaryResponse
@@ -40,6 +40,6 @@ public sealed class DrillDownTransaction
 
         public Decimal Amount { get; set; }
         
-        public DateTime TransactionDateTime { get; set; }
+        public DateTimeOffset TransactionDateTime { get; set; }
     }
 }
diff --git a/EstateReportingAPI.DataTrasferObjects/TransactionDetail.cs b/EstateReportingAPI.DataTrasferObjects/TransactionDetail.cs
index 29fcb97..1ba3c02 100644
--- a/EstateReportingAPI.DataTrasferObjects/TransactionDetail.cs
+++ b/EstateReportingAPI.DataTrasferObjects/TransactionDetail.cs
@@ -5,7 +5,7 @@ namespace EstateReportingAPI.DataTransferObjects;
 public class TransactionDetail
 {
     public Guid Id { get; set; }
-    public DateTime DateTime { get; set; }
+    public DateTimeOffset DateTime { get; set; }
     public String Merchant { get; set; }
     public Guid MerchantId { get; set; }
     public Int32 MerchantReportingId { get; set; }
@@ -21,4 +21,4 @@ public class TransactionDetail
     public Decimal TotalFees { get; set; }
     public String SettlementReference { get; set; }
     public Int32 TransactionNumber { get; set; }
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI.DataTrasferObjects/TransactionDetailReportRequest.cs b/EstateReportingAPI.DataTrasferObjects/TransactionDetailReportRequest.cs
index 82a76a4..f768f91 100644
--- a/EstateReportingAPI.DataTrasferObjects/TransactionDetailReportRequest.cs
+++ b/EstateReportingAPI.DataTrasferObjects/TransactionDetailReportRequest.cs
@@ -8,6 +8,6 @@ public class TransactionDetailReportRequest
     public List<Int32>? Operators { get; set; }
     public List<Int32>? Merchants { get; set; }
     public List<Int32>? Products { get; set; }
-    public DateTime StartDate { get; set; }
-    public DateTime EndDate { get; set; }
-}
\ No newline at end of file
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+}
diff --git a/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryRequest.cs b/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryRequest.cs
index f89a212..3c2e3f9 100644
--- a/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryRequest.cs
+++ b/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryRequest.cs
@@ -22,8 +22,8 @@ public enum TransactionMixMeasure
 public class TransactionMixSummaryRequest
 {
     public int? MerchantReportingId { get; set; }
-    public DateTime StartDate { get; set; }
-    public DateTime EndDate { get; set; }
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
     public TransactionMixBreakdown Breakdown { get; set; }
     public TransactionMixMeasure Measure { get; set; }
     public int TopN { get; set; } = 5;
diff --git a/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryResponse.cs b/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryResponse.cs
index 2109cc4..9fdb02a 100644
--- a/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryResponse.cs
+++ b/EstateReportingAPI.DataTrasferObjects/TransactionMixSummaryResponse.cs
@@ -5,8 +5,8 @@ namespace EstateReportingAPI.DataTransferObjects;
 
 public class TransactionMixSummaryResponse
 {
-    public DateTime FromDate { get; set; }
-    public DateTime ToDate { get; set; }
+    public DateOnly FromDate { get; set; }
+    public DateOnly ToDate { get; set; }
     public TransactionMixBreakdown Breakdown { get; set; }
     public TransactionMixMeasure Measure { get; set; }
     public int TotalCount { get; set; }
@@ -26,7 +26,7 @@ public class TransactionMixSummaryGroup
 public class TransactionMixSummaryTransaction
 {
     public Guid Id { get; set; }
-    public DateTime DateTime { get; set; }
+    public DateTimeOffset DateTime { get; set; }
     public string? Merchant { get; set; }
     public Guid MerchantId { get; set; }
     public int MerchantReportingId { get; set; }
diff --git a/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByMerchantRequest.cs b/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByMerchantRequest.cs
index b4183b6..dae9ed3 100644
--- a/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByMerchantRequest.cs
+++ b/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByMerchantRequest.cs
@@ -7,6 +7,6 @@ public class TransactionSummaryByMerchantRequest
 {
     public List<Int32>? Operators { get; set; }
     public List<Int32>? Merchants { get; set; }
-    public DateTime StartDate { get; set; }
-    public DateTime EndDate { get; set; }
-}
\ No newline at end of file
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+}
diff --git a/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByOperatorRequest.cs b/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByOperatorRequest.cs
index 7cf4b1b..4852088 100644
--- a/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByOperatorRequest.cs
+++ b/EstateReportingAPI.DataTrasferObjects/TransactionSummaryByOperatorRequest.cs
@@ -6,6 +6,6 @@ public class TransactionSummaryByOperatorRequest
 {
     public List<Int32>? Operators { get; set; }
     public List<Int32>? Merchants { get; set; }
-    public DateTime StartDate { get; set; }
-    public DateTime EndDate { get; set; }
-}
\ No newline at end of file
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+}
diff --git a/EstateReportingAPI.IntegrationTests/CalendarEndpointTests.cs b/EstateReportingAPI.IntegrationTests/CalendarEndpointTests.cs
index 0ff753f..566c9e8 100644
--- a/EstateReportingAPI.IntegrationTests/CalendarEndpointTests.cs
+++ b/EstateReportingAPI.IntegrationTests/CalendarEndpointTests.cs
@@ -37,7 +37,7 @@ public async Task CalendarEndpoint_GetComparisonDates_DatesReturned() {
             List<DateTime> expectedDates = datesInYear.Where(d => d <= DateTime.Now.Date.AddDays(-1)).ToList();
             dates.ShouldNotBeNull();
             foreach (DateTime date in expectedDates) {
-                dates.Select(d => d.Date).Contains(date.Date).ShouldBeTrue();
+                dates.Select(d => d.Date).Contains(DateOnly.FromDateTime(date.Date)).ShouldBeTrue();
             }
 
             dates.Select(d => d.Description).Contains("Yesterday").ShouldBeTrue();
diff --git a/EstateReportingAPI.IntegrationTests/ControllerTestsBase.cs b/EstateReportingAPI.IntegrationTests/ControllerTestsBase.cs
index b901d50..4a6261c 100644
--- a/EstateReportingAPI.IntegrationTests/ControllerTestsBase.cs
+++ b/EstateReportingAPI.IntegrationTests/ControllerTestsBase.cs
@@ -36,6 +36,30 @@ protected static void AssertDecimalMatchesTo4Places(decimal actual, decimal expe
             .ShouldBe(Math.Round(expected, 4, MidpointRounding.AwayFromZero));
     }
 
+    protected static DateTime GetUkLocalNow()
+    {
+        return TimeZoneInfo.ConvertTime(DateTimeOffset.UtcNow, GetReportingTimeZone()).DateTime;
+    }
+
+    protected static DateTimeOffset ToUkDateTimeOffset(DateTime localDateTime)
+    {
+        DateTime unspecified = DateTime.SpecifyKind(localDateTime, DateTimeKind.Unspecified);
+        TimeZoneInfo timeZone = GetReportingTimeZone();
+        return new DateTimeOffset(unspecified, timeZone.GetUtcOffset(unspecified));
+    }
+
+    private static TimeZoneInfo GetReportingTimeZone()
+    {
+        try
+        {
+            return TimeZoneInfo.FindSystemTimeZoneById("Europe/London");
+        }
+        catch (TimeZoneNotFoundException)
+        {
+            return TimeZoneInfo.FindSystemTimeZoneById("GMT Standard Time");
+        }
+    }
+
     public virtual async ValueTask InitializeAsync()
     {
         IntegrationTestEnvironment environment = await IntegrationTestEnvironment.GetAsync();
diff --git a/EstateReportingAPI.IntegrationTests/FileImportLogsEndpointTests.cs b/EstateReportingAPI.IntegrationTests/FileImportLogsEndpointTests.cs
index b0e83db..26331bb 100644
--- a/EstateReportingAPI.IntegrationTests/FileImportLogsEndpointTests.cs
+++ b/EstateReportingAPI.IntegrationTests/FileImportLogsEndpointTests.cs
@@ -45,7 +45,7 @@ private void AssertFileDetailsMatchesSource(FileDetails actual,
             actual.FileId.ShouldBe(fileId);
             actual.FileName.ShouldBe(fileName);
             actual.FileProfile.ShouldBe(fileProfileId.ToString());
-            actual.DateTimeUploaded.ShouldBe(uploadedAt, TimeSpan.FromSeconds(1));
+            actual.DateTimeUploaded.ShouldBe(ToUkDateTimeOffset(uploadedAt), TimeSpan.FromSeconds(1));
             actual.UserId.ShouldBe(userId);
             actual.UploadedBy.ShouldBe(uploadedBy);
             actual.MerchantId.ShouldBe(merchantId);
@@ -98,7 +98,7 @@ public async Task FileImportEndpoint_GetFileImportLogs_WithMerchantFilter_Return
 
             var match = list.Single();
             match.FileImportLogId.ShouldBe(sourceLog.FileImportLogId);
-            match.ImportLogDateTime.ShouldBe(sourceLog.ImportLogDateTime, TimeSpan.FromSeconds(1));
+            match.ImportLogDateTime.ShouldBe(ToUkDateTimeOffset(sourceLog.ImportLogDateTime), TimeSpan.FromSeconds(1));
             match.FileDetailsList.Count.ShouldBe(1);
 
             var fileDetail = match.FileDetailsList.Single();
@@ -146,7 +146,7 @@ public async Task FileImportEndpoint_GetFileImportLog_WithMerchantFilter_Returns
             var sourceLine = this.context.FileLines.Single(x => x.FileId == fileId);
 
             item.FileImportLogId.ShouldBe(sourceLog.FileImportLogId);
-            item.ImportLogDateTime.ShouldBe(sourceLog.ImportLogDateTime, TimeSpan.FromSeconds(1));
+            item.ImportLogDateTime.ShouldBe(ToUkDateTimeOffset(sourceLog.ImportLogDateTime), TimeSpan.FromSeconds(1));
             item.FileDetailsList.Count.ShouldBe(1);
 
             var fileDetail = item.FileDetailsList.Single();
@@ -192,7 +192,7 @@ public async Task FileImportEndpoint_GetFileImportLog_ReturnsInsertedData()
             var sourceLine = this.context.FileLines.Single(x => x.FileId == fileId);
 
             item.FileImportLogId.ShouldBe(sourceLog.FileImportLogId);
-            item.ImportLogDateTime.ShouldBe(sourceLog.ImportLogDateTime, TimeSpan.FromSeconds(1));
+            item.ImportLogDateTime.ShouldBe(ToUkDateTimeOffset(sourceLog.ImportLogDateTime), TimeSpan.FromSeconds(1));
             item.FileDetailsList.Count.ShouldBe(1);
 
             var fileDetail = item.FileDetailsList.Single();
@@ -277,7 +277,7 @@ public async Task FileImportEndpoint_GetFileImportLogs_ReturnsInsertedData()
 
             var match = list.Single();
             match.FileImportLogId.ShouldBe(sourceLog.FileImportLogId);
-            match.ImportLogDateTime.ShouldBe(sourceLog.ImportLogDateTime, TimeSpan.FromSeconds(1));
+            match.ImportLogDateTime.ShouldBe(ToUkDateTimeOffset(sourceLog.ImportLogDateTime), TimeSpan.FromSeconds(1));
             match.FileDetailsList.Count.ShouldBe(1);
 
             var fileDetail = match.FileDetailsList.Single();
diff --git a/EstateReportingAPI.IntegrationTests/MerchantEndpointTests.cs b/EstateReportingAPI.IntegrationTests/MerchantEndpointTests.cs
index c2d9949..83162aa 100644
--- a/EstateReportingAPI.IntegrationTests/MerchantEndpointTests.cs
+++ b/EstateReportingAPI.IntegrationTests/MerchantEndpointTests.cs
@@ -283,7 +283,7 @@ public async Task MerchantEndpoint_GetMerchantSchedule_MerchantScheduleReturned(
     [Fact]
     public async Task MerchantEndpoint_GetMerchantKpis_MerchantKpisReturned()
     {
-        DateTime now = DateTime.Now;
+        DateTime now = GetUkLocalNow();
 
         await this.helper.AddEstate("Test Estate", "Ref1");
         
diff --git a/EstateReportingAPI.IntegrationTests/TransactionMixSummaryEndpointTests.cs b/EstateReportingAPI.IntegrationTests/TransactionMixSummaryEndpointTests.cs
index 18c777e..10616cb 100644
--- a/EstateReportingAPI.IntegrationTests/TransactionMixSummaryEndpointTests.cs
+++ b/EstateReportingAPI.IntegrationTests/TransactionMixSummaryEndpointTests.cs
@@ -31,7 +31,7 @@ private void AssertTransactionMixSummaryTransactionMatches(TransactionMixSummary
         var product = this.context.ContractProducts.Single(p => p.ContractProductId == source.ContractProductId && p.ContractId == source.ContractId);
 
         actual.Id.ShouldBe(source.TransactionId);
-        actual.DateTime.ShouldBe(source.TransactionDateTime);
+        actual.DateTime.ShouldBe(ToUkDateTimeOffset(source.TransactionDateTime));
         actual.Merchant.ShouldBe(merchant.Name);
         actual.MerchantId.ShouldBe(merchant.MerchantId);
         actual.MerchantReportingId.ShouldBe(merchant.MerchantReportingId);
@@ -101,8 +101,8 @@ public async Task TransactionMixSummary_ProductBreakdown_ReturnsGroupedResults()
         var request = new TransactionMixSummaryRequest
         {
             MerchantReportingId = 1,
-            StartDate = startDate,
-            EndDate = endDate,
+            StartDate = DateOnly.FromDateTime(startDate),
+            EndDate = DateOnly.FromDateTime(endDate),
             Breakdown = TransactionMixBreakdown.Product,
             Measure = TransactionMixMeasure.Count,
             TopN = 5
@@ -113,8 +113,8 @@ public async Task TransactionMixSummary_ProductBreakdown_ReturnsGroupedResults()
 
         result.IsSuccess.ShouldBeTrue();
         result.Data.ShouldNotBeNull();
-        result.Data.FromDate.ShouldBe(startDate);
-        result.Data.ToDate.ShouldBe(endDate);
+        result.Data.FromDate.ShouldBe(DateOnly.FromDateTime(startDate));
+        result.Data.ToDate.ShouldBe(DateOnly.FromDateTime(endDate));
         result.Data.Breakdown.ShouldBe(TransactionMixBreakdown.Product);
         result.Data.Measure.ShouldBe(TransactionMixMeasure.Count);
         result.Data.TotalCount.ShouldBe(3);
@@ -138,8 +138,8 @@ public async Task TransactionMixSummary_InvalidDateRange_ReturnsBadRequest()
         var request = new TransactionMixSummaryRequest
         {
             MerchantReportingId = 1,
-            StartDate = DateTime.Now.Date,
-            EndDate = DateTime.Now.Date.AddDays(-1),
+            StartDate = DateOnly.FromDateTime(DateTime.Now.Date),
+            EndDate = DateOnly.FromDateTime(DateTime.Now.Date.AddDays(-1)),
             Breakdown = TransactionMixBreakdown.Operator,
             Measure = TransactionMixMeasure.Value,
             TopN = 5
diff --git a/EstateReportingAPI.IntegrationTests/TransactionsEndpointTests.cs b/EstateReportingAPI.IntegrationTests/TransactionsEndpointTests.cs
index 9a4452c..7346d13 100644
--- a/EstateReportingAPI.IntegrationTests/TransactionsEndpointTests.cs
+++ b/EstateReportingAPI.IntegrationTests/TransactionsEndpointTests.cs
@@ -90,7 +90,7 @@ private static void AssertDrillDownTransactionMatches(DrillDownTransaction actua
         actual.Product.ShouldBe(expectedProduct);
         actual.Status.ShouldBe(source.IsAuthorised ? "Successful" : "Failed");
         actual.Amount.ShouldBe(source.TransactionAmount);
-        actual.TransactionDateTime.ShouldBe(source.TransactionDateTime);
+        actual.TransactionDateTime.ShouldBe(ToUkDateTimeOffset(source.TransactionDateTime));
     }
 
     private static void AssertRecentActivityReceiptItemMatches(JsonElement actual,
@@ -104,7 +104,7 @@ private static void AssertRecentActivityReceiptItemMatches(JsonElement actual,
         GetPropertyCaseInsensitive(actual, "operator").GetString().ShouldBe(expectedOperator);
         GetPropertyCaseInsensitive(actual, "status").GetString().ShouldBe(source.IsAuthorised ? "Successful" : "Failed");
         GetPropertyCaseInsensitive(actual, "amount").GetDecimal().ShouldBe(source.TransactionAmount);
-        DateTime.Parse(GetPropertyCaseInsensitive(actual, "transactionDateTime").GetString()!).ShouldBe(source.TransactionDateTime);
+        DateTimeOffset.Parse(GetPropertyCaseInsensitive(actual, "transactionDateTime").GetString()!).ShouldBe(ToUkDateTimeOffset(source.TransactionDateTime));
         GetPropertyCaseInsensitive(actual, "receiptReference").GetString().ShouldBe(expectedReceiptReference);
     }
 
@@ -114,7 +114,7 @@ private void AssertTransactionDetailMatches(TransactionDetail actual, Transactio
         var product = this.context.ContractProducts.Single(p => p.ContractProductId == source.ContractProductId && p.ContractId == source.ContractId);
 
         actual.Id.ShouldBe(source.TransactionId);
-        actual.DateTime.ShouldBe(source.TransactionDateTime);
+        actual.DateTime.ShouldBe(ToUkDateTimeOffset(source.TransactionDateTime));
         actual.Merchant.ShouldBe(merchant.Name);
         actual.MerchantId.ShouldBe(merchant.MerchantId);
         actual.MerchantReportingId.ShouldBe(merchant.MerchantReportingId);
@@ -515,8 +515,8 @@ public async Task TransactionsEndpoint_TransactionDetailReport_NoFilters_Transac
             
         List<DateTime> orderedDates = transactionDates.OrderBy(x => x).ToList();
         TransactionDetailReportRequest request = new TransactionDetailReportRequest {
-            StartDate = orderedDates.First(),
-            EndDate = orderedDates.Last(),
+            StartDate = DateOnly.FromDateTime(orderedDates.First()),
+            EndDate = DateOnly.FromDateTime(orderedDates.Last()),
             Merchants = [],
             Operators = [],
             Products = []
@@ -586,8 +586,8 @@ public async Task TransactionsEndpoint_TransactionDetailReport_MerchantFilter_Tr
         List<DateTime> orderedDates = transactionDates.OrderBy(x => x).ToList();
         TransactionDetailReportRequest request = new TransactionDetailReportRequest
         {
-            StartDate = orderedDates.First(),
-            EndDate = orderedDates.Last(),
+            StartDate = DateOnly.FromDateTime(orderedDates.First()),
+            EndDate = DateOnly.FromDateTime(orderedDates.Last()),
             Merchants = merchantsForFilter.Select(m=> m.MerchantReportingId).ToList(),
             Operators = [],
             Products = []
@@ -660,8 +660,8 @@ public async Task TransactionsEndpoint_TransactionDetailReport_OperatorFilter_Tr
         List<DateTime> orderedDates = transactionDates.OrderBy(x => x).ToList();
         TransactionDetailReportRequest request = new TransactionDetailReportRequest
         {
-            StartDate = orderedDates.First(),
-            EndDate = orderedDates.Last(),
+            StartDate = DateOnly.FromDateTime(orderedDates.First()),
+            EndDate = DateOnly.FromDateTime(orderedDates.Last()),
             Merchants = [],
             Operators = operatorsForFilter.Select(o=> o.OperatorReportingId).ToList(),
             Products = []
@@ -733,8 +733,8 @@ public async Task TransactionsEndpoint_TransactionDetailReport_ProductFilter_Tra
         List<DateTime> orderedDates = transactionDates.OrderBy(x => x).ToList();
         TransactionDetailReportRequest request = new TransactionDetailReportRequest
         {
-            StartDate = orderedDates.First(),
-            EndDate = orderedDates.Last(),
+            StartDate = DateOnly.FromDateTime(orderedDates.First()),
+            EndDate = DateOnly.FromDateTime(orderedDates.Last()),
             Merchants = [],
             Operators = [],
             Products = productsForFilter.Select(c => c.contractProductReportingId).ToList(),
@@ -856,8 +856,8 @@ public async Task TransactionsEndpoint_TransactionSummaryByMerchantReport_NoFilt
         List<DateTime> orderedDates = transactionDates.OrderBy(x => x).ToList();
         TransactionDetailReportRequest request = new TransactionDetailReportRequest
         {
-            StartDate = orderedDates.First(),
-            EndDate = orderedDates.Last(),
+            StartDate = DateOnly.FromDateTime(orderedDates.First()),
+            EndDate = DateOnly.FromDateTime(orderedDates.Last()),
             Merchants = [],
             Operators = [],
             Products = []
@@ -994,8 +994,8 @@ public async Task TransactionsEndpoint_TransactionSummaryByOperatorReport_NoFilt
         List<DateTime> orderedDates = transactionDates.OrderBy(x => x).ToList();
         TransactionDetailReportRequest request = new TransactionDetailReportRequest
         {
-            StartDate = orderedDates.First(),
-            EndDate = orderedDates.Last(),
+            StartDate = DateOnly.FromDateTime(orderedDates.First()),
+            EndDate = DateOnly.FromDateTime(orderedDates.Last()),
             Merchants = [],
             Operators = [],
             Products = []
@@ -1300,8 +1300,8 @@ public async Task TransactionsEndpoint_MerchantDailyPerformanceSummary_ReturnsMe
         MerchantDailyPerformanceSummaryRequest request = new()
         {
             MerchantReportingId = merchant.MerchantReportingId,
-            StartDate = transactionDate,
-            EndDate = transactionDate
+            StartDate = DateOnly.FromDateTime(transactionDate),
+            EndDate = DateOnly.FromDateTime(transactionDate)
         };
 
         var result = await this.CreateAndSendHttpRequestMessage<MerchantDailyPerformanceSummaryResponse>(
@@ -1435,8 +1435,8 @@ await this.helper.BuildTransactionX(
         MerchantDailyPerformanceSummaryRequest request = new()
         {
             MerchantReportingId = merchant.MerchantReportingId,
-            StartDate = transactionDate,
-            EndDate = transactionDate
+            StartDate = DateOnly.FromDateTime(transactionDate),
+            EndDate = DateOnly.FromDateTime(transactionDate)
         };
 
         var result = await this.CreateAndSendHttpRequestMessage<MerchantDailyPerformanceSummaryResponse>(
@@ -1500,8 +1500,8 @@ await this.helper.BuildTransactionX(
         MerchantDailyPerformanceSummaryRequest request = new()
         {
             MerchantReportingId = merchant.MerchantReportingId,
-            StartDate = transactionDate,
-            EndDate = transactionDate
+            StartDate = DateOnly.FromDateTime(transactionDate),
+            EndDate = DateOnly.FromDateTime(transactionDate)
         };
 
         var result = await this.CreateAndSendHttpRequestMessage<MerchantDailyPerformanceSummaryResponse>(
@@ -1530,8 +1530,8 @@ public async Task TransactionsEndpoint_MerchantDailyPerformanceSummary_NoSales_R
 
         MerchantDailyPerformanceSummaryRequest request = new()
         {
-            StartDate = startDate,
-            EndDate = endDate,
+            StartDate = DateOnly.FromDateTime(startDate),
+            EndDate = DateOnly.FromDateTime(endDate),
             MerchantReportingId = merchant.MerchantReportingId
         };
 
@@ -1629,7 +1629,7 @@ await this.helper.BuildTransactionX(reportDate.AddHours(9), otherMerchant.Mercha
         await this.helper.RunHistoricTransactionsSummaryProcessing(reportDate);
 
         var payload = JsonSerializer.Serialize(new Dictionary<string, object?> {
-            ["report_date"] = reportDate,
+            ["report_date"] = reportDate.ToString("yyyy-MM-dd"),
             ["merchant_reporting_id"] = merchant.MerchantReportingId,
             ["search_text"] = null,
             ["page_number"] = 1,
@@ -1674,7 +1674,7 @@ static JsonElement GetPropertyCaseInsensitive(JsonElement element, string proper
             throw new KeyNotFoundException($"Property '{propertyName}' was not found.");
         }
 
-        DateTime.Parse(GetPropertyCaseInsensitive(document.RootElement, "reportDate").GetString()!).Date.ShouldBe(reportDate);
+        DateOnly.Parse(GetPropertyCaseInsensitive(document.RootElement, "reportDate").GetString()!).ShouldBe(DateOnly.FromDateTime(reportDate));
         GetPropertyCaseInsensitive(document.RootElement, "pageNumber").GetInt32().ShouldBe(1);
         GetPropertyCaseInsensitive(document.RootElement, "pageSize").GetInt32().ShouldBe(10);
         GetPropertyCaseInsensitive(document.RootElement, "totalCount").GetInt32().ShouldBe(2);
@@ -1708,7 +1708,7 @@ await this.helper.BuildTransactionX(reportDate.AddHours(9), otherMerchant.Mercha
         await this.helper.RunHistoricTransactionsSummaryProcessing(reportDate);
 
         var payload = JsonSerializer.Serialize(new Dictionary<string, object?> {
-            ["report_date"] = reportDate,
+            ["report_date"] = reportDate.ToString("yyyy-MM-dd"),
             ["merchant_reporting_id"] = merchant.MerchantReportingId,
             ["search_text"] = "receipt",
             ["page_number"] = 1,
diff --git a/EstateReportingAPI.Models/GetRecentActivityReceiptReportResponse.cs b/EstateReportingAPI.Models/GetRecentActivityReceiptReportResponse.cs
index b517b96..967000b 100644
--- a/EstateReportingAPI.Models/GetRecentActivityReceiptReportResponse.cs
+++ b/EstateReportingAPI.Models/GetRecentActivityReceiptReportResponse.cs
@@ -5,7 +5,7 @@ namespace EstateReportingAPI.Models;
 
 public class GetRecentActivityReceiptReportResponse
 {
-    public DateTime ReportDate { get; set; }
+    public DateOnly ReportDate { get; set; }
     public int PageNumber { get; set; }
     public int PageSize { get; set; }
     public int TotalCount { get; set; }
diff --git a/EstateReportingAPI.Models/TransactionMixSummaryResponse.cs b/EstateReportingAPI.Models/TransactionMixSummaryResponse.cs
index fbc6c91..e4a2c2b 100644
--- a/EstateReportingAPI.Models/TransactionMixSummaryResponse.cs
+++ b/EstateReportingAPI.Models/TransactionMixSummaryResponse.cs
@@ -2,8 +2,8 @@ namespace EstateReportingAPI.Models;
 
 public class TransactionMixSummaryResponse
 {
-    public DateTime FromDate { get; set; }
-    public DateTime ToDate { get; set; }
+    public DateOnly FromDate { get; set; }
+    public DateOnly ToDate { get; set; }
     public TransactionMixBreakdown Breakdown { get; set; }
     public TransactionMixMeasure Measure { get; set; }
     public int TotalCount { get; set; }
diff --git a/EstateReportingAPI/Bootstrapper/RepositoryRegistry.cs b/EstateReportingAPI/Bootstrapper/RepositoryRegistry.cs
index 7932655..de064b6 100644
--- a/EstateReportingAPI/Bootstrapper/RepositoryRegistry.cs
+++ b/EstateReportingAPI/Bootstrapper/RepositoryRegistry.cs
@@ -16,6 +16,7 @@ namespace EstateReportingAPI.Bootstrapper;
 [ExcludeFromCodeCoverage]
 public class RepositoryRegistry : ServiceRegistry{
     public RepositoryRegistry() {
+        this.AddSingleton<ReportingDatePolicy>(_ => new ReportingDatePolicy(TimeProvider.System));
         this.AddSingleton<ITransactionReportingService, TransactionReportingService>();
         this.AddSingleton<IEstateReportingService, EstateReportingService>();
         this.AddSingleton<ISettlementReportingService, SettlementReportingService>();
diff --git a/EstateReportingAPI/Handlers/CalenderHandler.cs b/EstateReportingAPI/Handlers/CalenderHandler.cs
index a66deee..6ae0c6d 100644
--- a/EstateReportingAPI/Handlers/CalenderHandler.cs
+++ b/EstateReportingAPI/Handlers/CalenderHandler.cs
@@ -1,4 +1,5 @@
-using EstateReportingAPI.BusinessLogic.Queries;
+using EstateReportingAPI.BusinessLogic;
+using EstateReportingAPI.BusinessLogic.Queries;
 using EstateReportingAPI.Common;
 using EstateReportingAPI.DataTrasferObjects;
 using EstateReportingAPI.Models;
@@ -9,22 +10,31 @@
 
 namespace EstateReportingAPI.Handlers;
 
-public static class CalenderHandler {
+public static class CalenderHandler
+{
     public static async Task<IResult> GetCalendarComparisonDates(IEstateContext estateContext,
-                                                                 IMediator mediator,
-                                                                 CancellationToken cancellationToken) {
-        CalendarQueries.GetComparisonDatesQuery query = new CalendarQueries.GetComparisonDatesQuery(estateContext.EstateId);
+                                                                  ReportingDatePolicy datePolicy,
+                                                                  IMediator mediator,
+                                                                  CancellationToken cancellationToken)
+    {
+        CalendarQueries.GetComparisonDatesQuery query = new(estateContext.EstateId);
         Result<List<Calendar>> result = await mediator.Send(query, cancellationToken);
 
-        return ResponseFactory.FromResult(result, r => {
-            List<ComparisonDate> response = new() { new() { Date = DateTime.Now.Date.AddDays(-1), Description = "Yesterday", OrderValue = 0 }, new() { Date = DateTime.Now.Date.AddDays(-7), Description = "Last Week", OrderValue = 1 }, new() { Date = DateTime.Now.Date.AddMonths(-1), Description = "Last Month", OrderValue = 2 } };
+        return ResponseFactory.FromResult(result, r =>
+        {
+            DateTime today = datePolicy.Today.ToDateTime(TimeOnly.MinValue);
+            List<ComparisonDate> response = new()
+            {
+                new() { Date = DateOnly.FromDateTime(today.AddDays(-1)), Description = "Yesterday", OrderValue = 0 },
+                new() { Date = DateOnly.FromDateTime(today.AddDays(-7)), Description = "Last Week", OrderValue = 1 },
+                new() { Date = DateOnly.FromDateTime(today.AddMonths(-1)), Description = "Last Month", OrderValue = 2 }
+            };
 
             int orderValue = 3;
-            foreach (Calendar d in r) {
-                response.Add(new ComparisonDate { Date = d.Date, Description = d.Date.ToString("yyyy-MM-dd"), OrderValue = orderValue++ });
-            }
+            foreach (Calendar d in r)
+                response.Add(new ComparisonDate { Date = DateOnly.FromDateTime(d.Date), Description = d.Date.ToString("yyyy-MM-dd"), OrderValue = orderValue++ });
 
             return response.OrderBy(d => d.OrderValue);
         });
     }
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI/Handlers/FileImportHandler.cs b/EstateReportingAPI/Handlers/FileImportHandler.cs
index f61e09b..e0b9e01 100644
--- a/EstateReportingAPI/Handlers/FileImportHandler.cs
+++ b/EstateReportingAPI/Handlers/FileImportHandler.cs
@@ -34,20 +34,21 @@ public static class FileImportHandler
 {
     public static async Task<IResult> GetFileImportLogList(IEstateContext estateContext,
                                                            [FromQuery] Guid? merchantId,
-                                                           [FromQuery] DateTime startDate,
-                                                           [FromQuery] DateTime endDate,
+                                                           [FromQuery] DateOnly startDate,
+                                                           [FromQuery] DateOnly endDate,
+                                                           BusinessLogic.ReportingDatePolicy datePolicy,
                                                            IMediator mediator,
                                                            CancellationToken cancellationToken)
     {
-        FileImportLogQueries.GetFileImportLogListQuery query = new(estateContext.EstateId, merchantId, startDate, endDate);
+        FileImportLogQueries.GetFileImportLogListQuery query = new(estateContext.EstateId, merchantId, startDate.ToDateTime(TimeOnly.MinValue), endDate.ToDateTime(TimeOnly.MinValue));
         Result<List<FileImportLog>> result = await mediator.Send(query, cancellationToken);
 
         return ResponseFactory.FromResult(result, r => r.Select(m => new DataTransferObjects.FileImportLog
         {
             FileImportLogId = m.FileImportLogId,
-            ImportLogDateTime = m.ImportLogDateTime,
+            ImportLogDateTime = datePolicy.ToDateTimeOffset(m.ImportLogDateTime),
             FileDetailsList = m.FileDetailsList.Select(fd => new DataTransferObjects.FileDetails {
-                DateTimeUploaded = fd.DateTimeUploaded,
+                DateTimeUploaded = datePolicy.ToDateTimeOffset(fd.DateTimeUploaded),
                 FileId = fd.FileId,
                 FileName = fd.FileName,
                 FileProfile = fd.FileProfile,
@@ -67,6 +68,7 @@ public static async Task<IResult> GetFileImportLogList(IEstateContext estateCont
     public static async Task<IResult> GetFileImportLog(IEstateContext estateContext,
                                                        [FromRoute] Guid fileImportLogId,
                                                            [FromQuery] Guid? merchantId,
+                                                            BusinessLogic.ReportingDatePolicy datePolicy,
                                                            IMediator mediator,
                                                            CancellationToken cancellationToken)
     {
@@ -76,10 +78,10 @@ public static async Task<IResult> GetFileImportLog(IEstateContext estateContext,
         return ResponseFactory.FromResult(result, r => new DataTransferObjects.FileImportLog
         {
             FileImportLogId = r.FileImportLogId,
-            ImportLogDateTime = r.ImportLogDateTime,
+            ImportLogDateTime = datePolicy.ToDateTimeOffset(r.ImportLogDateTime),
             FileDetailsList = r.FileDetailsList.Select(fd => new DataTransferObjects.FileDetails
             {
-                DateTimeUploaded = fd.DateTimeUploaded,
+                DateTimeUploaded = datePolicy.ToDateTimeOffset(fd.DateTimeUploaded),
                 FileId = fd.FileId,
                 FileName = Path.GetFileName(fd.FileName),
                 FileProfile = fd.FileProfile,
diff --git a/EstateReportingAPI/Handlers/SettlementHandler.cs b/EstateReportingAPI/Handlers/SettlementHandler.cs
index b25f87b..6ca9413 100644
--- a/EstateReportingAPI/Handlers/SettlementHandler.cs
+++ b/EstateReportingAPI/Handlers/SettlementHandler.cs
@@ -9,10 +9,10 @@ namespace EstateReportingAPI.Handlers;
 
 public static class SettlementHandler {
     public static async Task<IResult> TodaysSettlements(IEstateContext estateContext,
-                                                        [FromQuery] DateTime comparisonDate,
+                                                        [FromQuery] DateOnly comparisonDate,
                                                         IMediator mediator,
                                                         CancellationToken cancellationToken) {
-        var query = new SettlementQueries.TodaysSettlementQuery(estateContext.EstateId, comparisonDate);
+        var query = new SettlementQueries.TodaysSettlementQuery(estateContext.EstateId, comparisonDate.ToDateTime(TimeOnly.MinValue));
         var result = await mediator.Send(query, cancellationToken);
 
         return ResponseFactory.FromResult(result, r => new TodaysSettlement() {
@@ -26,4 +26,4 @@ public static async Task<IResult> TodaysSettlements(IEstateContext estateContext
             TodaysSettlementValue = r.TodaysSettlementValue
         });
     }
-}
\ No newline at end of file
+}
diff --git a/EstateReportingAPI/Handlers/TransactionHandler.cs b/EstateReportingAPI/Handlers/TransactionHandler.cs
index 39f5215..bfeca40 100644
--- a/EstateReportingAPI/Handlers/TransactionHandler.cs
+++ b/EstateReportingAPI/Handlers/TransactionHandler.cs
@@ -14,11 +14,11 @@ public static class TransactionHandler {
     public static async Task<IResult> TodaysSales(IEstateContext estateContext,
                                                   [FromQuery] int? merchantReportingId,
                                                   [FromQuery] int? operatorReportingId,
-                                                  [FromQuery] DateTime comparisonDate,
+                                                  [FromQuery] DateOnly comparisonDate,
                                                   IMediator mediator,
                                                   CancellationToken cancellationToken)
     {
-        var query = new TransactionQueries.TodaysSalesQuery(estateContext.EstateId, merchantReportingId.GetValueOrDefault(), operatorReportingId.GetValueOrDefault(), comparisonDate);
+        var query = new TransactionQueries.TodaysSalesQuery(estateContext.EstateId, merchantReportingId.GetValueOrDefault(), operatorReportingId.GetValueOrDefault(), comparisonDate.ToDateTime(TimeOnly.MinValue));
         var result = await mediator.Send(query, cancellationToken);
 
         return ResponseFactory.FromResult(result, r => new TodaysSales
@@ -33,12 +33,12 @@ public static async Task<IResult> TodaysSales(IEstateContext estateContext,
     }
 
     public static async Task<IResult> TodaysFailedSales(IEstateContext estateContext,
-                                                        [FromQuery] DateTime comparisonDate,
+                                                        [FromQuery] DateOnly comparisonDate,
                                                         [FromQuery] string responseCode,
                                                         IMediator mediator,
                                                         CancellationToken cancellationToken)
     {
-        var query = new TransactionQueries.TodaysFailedSales(estateContext.EstateId, comparisonDate, responseCode);
+        var query = new TransactionQueries.TodaysFailedSales(estateContext.EstateId, comparisonDate.ToDateTime(TimeOnly.MinValue), responseCode);
         var result = await mediator.Send(query, cancellationToken);
 
         return ResponseFactory.FromResult(result, r => new TodaysSales
@@ -54,13 +54,14 @@ public static async Task<IResult> TodaysFailedSales(IEstateContext estateContext
 
     public static async Task<IResult> TransactionDetailReport(IEstateContext estateContext,
                                                               [FromBody] TransactionDetailReportRequest request, 
+                                                              BusinessLogic.ReportingDatePolicy datePolicy,
                                                               IMediator mediator, CancellationToken cancellationToken) {
         Models.TransactionDetailReportRequest queryRequest = new() {
             Merchants = request.Merchants,
             Operators = request.Operators,
             Products = request.Products,
-            StartDate = request.StartDate,
-            EndDate = request.EndDate
+            StartDate = request.StartDate.ToDateTime(TimeOnly.MinValue),
+            EndDate = request.EndDate.ToDateTime(TimeOnly.MinValue)
         };
 
         var query = new TransactionQueries.TransactionDetailReportQuery(estateContext.EstateId, queryRequest);
@@ -71,7 +72,7 @@ TransactionDetailReportResponse SuccessFactory (Models.TransactionDetailReportRe
                 Summary = new TransactionDetailSummary { TotalFees = r.Summary.TotalFees, TotalValue = r.Summary.TotalValue, TransactionCount = r.Summary.TransactionCount },
                 Transactions = r.Transactions.Select(t => new TransactionDetail {
                         TotalFees = t.TotalFees,
-                        DateTime = t.DateTime,
+                        DateTime = datePolicy.ToDateTimeOffset(t.DateTime),
                         Id = t.Id,
                         Merchant = t.Merchant,
                         Operator = t.Operator,
@@ -101,8 +102,8 @@ public static async Task<IResult> TransactionSummaryByMerchantReport(IEstateCont
         Models.TransactionSummaryByMerchantRequest queryRequest = new() {
             Merchants = request.Merchants,
             Operators = request.Operators,
-            StartDate = request.StartDate,
-            EndDate = request.EndDate
+            StartDate = request.StartDate.ToDateTime(TimeOnly.MinValue),
+            EndDate = request.EndDate.ToDateTime(TimeOnly.MinValue)
         };
         var query = new TransactionQueries.TransactionSummaryByMerchantQuery(estateContext.EstateId, queryRequest);
         var result = await mediator.Send(query, cancellationToken);
@@ -126,11 +127,11 @@ TransactionSummaryByMerchantResponse SuccessFactory (Models.TransactionSummaryBy
     }
 
     public static async Task<IResult> ProductPerformanceReport(IEstateContext estateContext,
-                                                               [FromQuery] DateTime startDate,
-                                                               [FromQuery] DateTime endDate,
+                                                               [FromQuery] DateOnly startDate,
+                                                               [FromQuery] DateOnly endDate,
                                                                IMediator mediator,
                                                                CancellationToken cancellationToken) {
-        var query = new TransactionQueries.ProductPerformanceQuery(estateContext.EstateId, startDate, endDate);
+        var query = new TransactionQueries.ProductPerformanceQuery(estateContext.EstateId, startDate.ToDateTime(TimeOnly.MinValue), endDate.ToDateTime(TimeOnly.MinValue));
         var result = await mediator.Send(query, cancellationToken);
         ProductPerformanceResponse SuccessFactory(Models.ProductPerformanceResponse r) =>
             new ProductPerformanceResponse
@@ -160,8 +161,8 @@ public static async Task<IResult> TransactionSummaryByOperatorReport(IEstateCont
         {
             Merchants = request.Merchants,
             Operators = request.Operators,
-            StartDate = request.StartDate,
-            EndDate = request.EndDate
+            StartDate = request.StartDate.ToDateTime(TimeOnly.MinValue),
+            EndDate = request.EndDate.ToDateTime(TimeOnly.MinValue)
         };
         var query = new TransactionQueries.TransactionSummaryByOperatorQuery(estateContext.EstateId, queryRequest);
         var result = await mediator.Send(query, cancellationToken);
@@ -188,6 +189,7 @@ TransactionSummaryByOperatorResponse SuccessFactory(Models.TransactionSummaryByO
 
     public static async Task<IResult> TransactionMixSummary(IEstateContext estateContext,
                                                             [FromBody] TransactionMixSummaryRequest request,
+                                                            BusinessLogic.ReportingDatePolicy datePolicy,
                                                             IMediator mediator,
                                                             CancellationToken cancellationToken)
     {
@@ -197,8 +199,8 @@ public static async Task<IResult> TransactionMixSummary(IEstateContext estateCon
         Models.TransactionMixSummaryRequest queryRequest = new()
         {
             MerchantReportingId = request.MerchantReportingId,
-            StartDate = request.StartDate,
-            EndDate = request.EndDate,
+            StartDate = request.StartDate.ToDateTime(TimeOnly.MinValue),
+            EndDate = request.EndDate.ToDateTime(TimeOnly.MinValue),
             Breakdown = (Models.TransactionMixBreakdown)request.Breakdown,
             Measure = (Models.TransactionMixMeasure)request.Measure,
             TopN = request.TopN
@@ -226,7 +228,7 @@ TransactionMixSummaryResponse SuccessFactory(Models.TransactionMixSummaryRespons
                 Transactions = r.Transactions.Select(t => new TransactionMixSummaryTransaction
                 {
                     Id = t.Id,
-                    DateTime = t.DateTime,
+                    DateTime = datePolicy.ToDateTimeOffset(t.DateTime),
                     Merchant = t.Merchant,
                     MerchantId = t.MerchantId,
                     MerchantReportingId = t.MerchantReportingId,
@@ -250,12 +252,13 @@ TransactionMixSummaryResponse SuccessFactory(Models.TransactionMixSummaryRespons
 
     public static async Task<IResult> RecentActivityReceiptReport(IEstateContext estateContext,
                                                                   [FromBody] GetRecentActivityReceiptReportRequest request,
+                                                                  BusinessLogic.ReportingDatePolicy datePolicy,
                                                                   IMediator mediator,
                                                                   CancellationToken cancellationToken)
     {
         Models.GetRecentActivityReceiptReportRequest queryRequest = new()
         {
-            ReportDate = request.ReportDate,
+            ReportDate = request.ReportDate.ToDateTime(TimeOnly.MinValue),
             MerchantReportingId = request.MerchantReportingId,
             SearchText = request.SearchText,
             PageNumber = request.PageNumber,
@@ -280,7 +283,7 @@ GetRecentActivityReceiptReportResponse SuccessFactory(Models.GetRecentActivityRe
                     Operator = item.Operator,
                     Status = item.Status,
                     Amount = item.Amount,
-                    TransactionDateTime = item.TransactionDateTime,
+                    TransactionDateTime = datePolicy.ToDateTimeOffset(item.TransactionDateTime),
                     ReceiptReference = item.ReceiptReference
                 }).ToList()
             };
@@ -289,11 +292,11 @@ GetRecentActivityReceiptReportResponse SuccessFactory(Models.GetRecentActivityRe
     }
 
     public static async Task<IResult> TodaysSalesByHour(IEstateContext estateContext,
-                                                        [FromQuery] DateTime comparisonDate,
+                                                        [FromQuery] DateOnly comparisonDate,
                                                         IMediator mediator,
                                                         CancellationToken cancellationToken)
     {
-        var query = new TransactionQueries.TodaysSalesByHour(estateContext.EstateId, comparisonDate);
+        var query = new TransactionQueries.TodaysSalesByHour(estateContext.EstateId, comparisonDate.ToDateTime(TimeOnly.MinValue));
         var result = await mediator.Send(query, cancellationToken);
 
         List<DataTransferObjects.TodaysSalesByHour> SuccessFactory(List<Models.TodaysSalesByHour> r) =>
@@ -312,12 +315,13 @@ public static async Task<IResult> TodaysSalesByHour(IEstateContext estateContext
 
     public static async Task<IResult> MerchantDailyPerformanceSummary(IEstateContext estateContext,
                                                                       [FromBody] MerchantDailyPerformanceSummaryRequest request,
+                                                                      BusinessLogic.ReportingDatePolicy datePolicy,
                                                                       IMediator mediator, CancellationToken cancellationToken)
     {
         TransactionQueries.MerchantDailyPerformanceSummaryQuery query = new(estateContext.EstateId, new Models.MerchantDailyPerformanceSummaryRequest {
-            EndDate = request.EndDate,
+            EndDate = request.EndDate.ToDateTime(TimeOnly.MinValue),
             MerchantReportingId = request.MerchantReportingId,
-            StartDate = request.StartDate
+            StartDate = request.StartDate.ToDateTime(TimeOnly.MinValue)
         });
         Result<Models.MerchantDailyPerformanceSummaryResponse> result = await mediator.Send(query, cancellationToken);
 
@@ -338,7 +342,7 @@ MerchantDailyPerformanceSummaryResponse SuccessFactory(Models.MerchantDailyPerfo
                     Product = $"{transaction.Operator} {transaction.Product}",
                     Status = transaction.Status,
                     Amount = transaction.Amount,
-                    TransactionDateTime = transaction.TransactionDateTime
+                    TransactionDateTime = datePolicy.ToDateTimeOffset(transaction.TransactionDateTime)
                 }).ToList() ?? []
             };
 
diff --git a/docs/superpowers/plans/2026-09-30-uk-report-date-time-policy.md b/docs/superpowers/plans/2026-09-30-uk-report-date-time-policy.md
new file mode 100644
index 0000000..8f553c1
--- /dev/null
+++ b/docs/superpowers/plans/2026-09-30-uk-report-date-time-policy.md
@@ -0,0 +1,84 @@
+# UK Report Date and Time Policy Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** Standardize report date handling around `Europe/London`, make clock-dependent behavior injectable, and expose explicit date/time API contracts.
+
+**Architecture:** Add a small reporting date policy around `TimeProvider` and `TimeZoneInfo`. Handlers normalize `DateOnly` request values into domain ranges; services use the normalized boundaries and the policy for current-day calculations. Existing database business-date columns remain UK-local values.
+
+**Tech Stack:** .NET 10, ASP.NET Minimal APIs, MediatR, EF Core, xUnit v3, Shouldly.
+
+**Spec:** `docs/superpowers/specs/2026-09-30-uk-report-date-time-policy-design.md`
+
+## Global Constraints
+
+- Use `Europe/London`; do not introduce estate-specific timezone storage.
+- Preserve persisted UK-local reporting-date semantics.
+- UI/client updates are out of scope.
+- Use injected `TimeProvider`; no direct system-clock calls in reporting production code.
+
+## Review Focus
+
+- Midnight rollover must select the UK business day, not the server day.
+- DST spring and autumn transitions must retain the correct UK business date.
+- Inclusive end dates must include the entire requested day.
+- Date-only report inputs must not depend on an implicit time component.
+- Settlement “today” comparisons must use a normalized UK business date.
+
+---
+
+### Task 1: Add and test the UK reporting date policy
+
+**Files:**
+- Create: `EstateReportingAPI.BusinessLogic/ReportingDatePolicy.cs`
+- Test: `EstateReportingAPI.BusinessLogic.UnitTests/ReportingDatePolicyTests.cs`
+
+- [ ] Write failing tests for `Today`, inclusive range normalization, and GMT/BST boundary behavior using `TimeProvider`.
+- [ ] Run the focused tests and verify they fail because the policy does not exist.
+- [ ] Implement `ReportingDatePolicy` with `Europe/London`, `Today`, `GetDateRange(DateOnly, DateOnly)`, and `GetCurrentLocalTime()`.
+- [ ] Run the focused tests and verify they pass.
+
+### Task 2: Register the policy and migrate API date contracts
+
+**Files:**
+- Modify: `EstateReportingAPI/Bootstrapper/RepositoryRegistry.cs`
+- Modify: report request DTOs under `EstateReportingAPI.DataTrasferObjects`
+- Modify: corresponding models and MediatR queries under `EstateReportingAPI.Models` and `EstateReportingAPI.BusinessLogic/Queries`
+- Test: request/handler contract coverage in existing unit and integration test projects
+
+- [ ] Add failing contract tests proving report date inputs are date-only and timestamp outputs are offset-aware.
+- [ ] Run the focused tests and verify the expected contract failures.
+- [ ] Register `TimeProvider.System` and `ReportingDatePolicy` through DI, then migrate report input types and timestamp output types.
+- [ ] Run focused tests and update all compile-time callers to use explicit date values.
+
+### Task 3: Migrate current-day and range-based reporting queries
+
+**Files:**
+- Modify: `EstateReportingAPI/Handlers/CalenderHandler.cs`
+- Modify: `EstateReportingAPI/Handlers/TransactionHandler.cs`
+- Modify: `EstateReportingAPI/Handlers/SettlementHandler.cs`
+- Modify: `EstateReportingAPI/Handlers/FileImportHandler.cs`
+- Modify: reporting services under `EstateReportingAPI.BusinessLogic/Services`
+
+- [ ] Add failing tests for inclusive range end behavior, UK current-day behavior, and normalized settlement dates.
+- [ ] Run the focused tests and verify they fail against the current implementation.
+- [ ] Replace direct `DateTime.Now`/`DateTime.Today` calls and `<= EndDate` range predicates with the policy and exclusive end boundaries.
+- [ ] Run the focused unit tests and verify they pass.
+
+### Task 4: Update integration coverage and remove direct clock calls
+
+**Files:**
+- Modify: `EstateReportingAPI.BusinessLogic.UnitTests/ReportingManagerReportTests.cs`
+- Modify: relevant files under `EstateReportingAPI.IntegrationTests`
+- Modify: any remaining reporting production files returned by `rg "DateTime\\.(Now|Today)"`
+
+- [ ] Add integration cases for midnight and both UK DST transitions.
+- [ ] Run the integration tests and correct any contract or boundary regressions.
+- [ ] Run a final search for direct system-clock calls in reporting production code and remove remaining occurrences.
+
+### Task 5: Verify the complete solution
+
+- [ ] Run the focused unit tests.
+- [ ] Run the complete solution test suite.
+- [ ] Run `dotnet build EstateReportingAPI.sln`.
+- [ ] Review the diff for unintended API or persistence changes.
diff --git a/docs/superpowers/specs/2026-09-30-uk-report-date-time-policy-design.md b/docs/superpowers/specs/2026-09-30-uk-report-date-time-policy-design.md
new file mode 100644
index 0000000..7099d64
--- /dev/null
+++ b/docs/superpowers/specs/2026-09-30-uk-report-date-time-policy-design.md
@@ -0,0 +1,23 @@
+# UK Report Date and Time Policy
+
+## Goal
+
+Standardize report date handling around the UK business timezone while making clock-dependent logic deterministic and making API date contracts explicit.
+
+## Decisions
+
+- Business/reporting dates are interpreted in `Europe/London`, including GMT/BST transitions.
+- Existing persisted reporting date fields remain UK-local business values.
+- Report date inputs use `DateOnly` semantics.
+- Report ranges are inclusive to callers and normalized internally to an exclusive end date.
+- Instant timestamps returned by the API use `DateTimeOffset`.
+- Clock-dependent logic uses an injected `TimeProvider`.
+- Estate-specific timezones are out of scope for this change.
+
+## Scope
+
+The policy applies to calendar defaults, transaction reports, settlement reports, file-import ranges, merchant KPI windows, and their tests and API contracts. UI/client changes are a follow-up job.
+
+## Testing
+
+Tests must cover fixed-clock behavior around midnight, UK daylight-saving transitions, inclusive report boundaries, calendar comparison dates, and settlement “today” handling.