diff --git a/apps/concierge/src/app/staff/staff-listing.component.ts b/apps/concierge/src/app/staff/staff-listing.component.ts
index 92d9b708ed..b06ce94b36 100644
--- a/apps/concierge/src/app/staff/staff-listing.component.ts
+++ b/apps/concierge/src/app/staff/staff-listing.component.ts
@@ -141,9 +141,14 @@ export class StaffListingComponent extends AsyncHandler {
 
     constructor() {
         super();
-        effect(() => {
+        effect((onCleanup) => {
             this.user_list();
             this.timeout('scroll', () => this.onScroll({}), 30);
+            // `onScroll` reads the document, so the timer must not outlive the
+            // effect. Relying on `ngOnDestroy` alone is not enough: the effect
+            // can flush during teardown and schedule a fresh timer after the
+            // base class has already cleared them.
+            onCleanup(() => this.clearTimeout('scroll'));
         });
     }
 
diff --git a/apps/concierge/src/tests/parking/parking-bookings-list.component.spec.ts b/apps/concierge/src/tests/parking/parking-bookings-list.component.spec.ts
index c09a520e06..266285f791 100644
--- a/apps/concierge/src/tests/parking/parking-bookings-list.component.spec.ts
+++ b/apps/concierge/src/tests/parking/parking-bookings-list.component.spec.ts
@@ -177,15 +177,21 @@ describe('ParkingBookingsListComponent', () => {
 
     it('should show all day when the booking matches the bookable period', () => {
         bookable_hours = { start: 8, end: 17 };
-        selected_date = new Date(2026, 6, 21, 8).valueOf();
+        // `isParkingAllDayBooking` converts the booking into `timezone`
+        // (Australia/Perth here) before checking that it starts and ends on the
+        // same day. Building these from machine-local hours only holds while
+        // the runner sits near +08:00 — on a UTC runner the end lands on the
+        // following Perth day and the booking stops reading as all-day. So
+        // state the instants in Perth, which is what the assertion is about.
+        selected_date = new Date('2026-07-21T08:00:00+08:00').valueOf();
         bookings = [
             {
                 id: 'booking-1',
                 asset_id: 'bay-1',
                 status: 'approved',
                 all_day: true,
-                date: new Date(2026, 6, 21, 8).valueOf(),
-                date_end: new Date(2026, 6, 21, 17).valueOf(),
+                date: new Date('2026-07-21T08:00:00+08:00').valueOf(),
+                date_end: new Date('2026-07-21T17:00:00+08:00').valueOf(),
                 duration: 9 * 60,
             } as unknown as Booking,
         ];
diff --git a/apps/concierge/src/tests/parking/parking-map.component.spec.ts b/apps/concierge/src/tests/parking/parking-map.component.spec.ts
index eb4bd65e04..1fad875f30 100644
--- a/apps/concierge/src/tests/parking/parking-map.component.spec.ts
+++ b/apps/concierge/src/tests/parking/parking-map.component.spec.ts
@@ -121,7 +121,11 @@ describe('ParkingMapComponent', () => {
 
     it('should select a one-hour parking availability window', () => {
         const state = spectator.inject(ParkingStateService);
-        const date = new Date('2026-07-13T09:30:00+10:00').valueOf();
+        // `setAvailabilityHour` picks the hour with `Date#setHours`, which is
+        // the machine's timezone, so both the input and the expectation are
+        // built the same way. Writing either as a fixed UTC offset would pin
+        // the test to a runner in that zone.
+        const date = new Date(2026, 6, 13, 9, 30).valueOf();
         Object.defineProperty(spectator.component, 'options', {
             value: () => ({ date, all_day: true, zones: [] }),
             configurable: true,
@@ -130,7 +134,7 @@ describe('ParkingMapComponent', () => {
         spectator.component.setAvailabilityHour(14);
 
         expect(state.setOptions).toHaveBeenCalledWith({
-            date: new Date('2026-07-13T14:00:00+10:00').valueOf(),
+            date: new Date(2026, 6, 13, 14, 0, 0, 0).valueOf(),
             all_day: false,
             duration: 60,
         });
diff --git a/apps/concierge/src/tests/reports/attendance/site-attendance-report.service.spec.ts b/apps/concierge/src/tests/reports/attendance/site-attendance-report.service.spec.ts
index 29d6338dee..fb18072305 100644
--- a/apps/concierge/src/tests/reports/attendance/site-attendance-report.service.spec.ts
+++ b/apps/concierge/src/tests/reports/attendance/site-attendance-report.service.spec.ts
@@ -697,9 +697,12 @@ describe('SiteAttendanceReportService', () => {
     });
 
     it('should export report data', () => {
+        // The filename is built with date-fns `format`, which renders in the
+        // machine's timezone, so the range is set the same way. A UTC instant
+        // here names the previous day once the runner is west of Greenwich.
         spectator.service.setOptions({
-            start: new Date('2026-04-06T00:00:00Z').valueOf(),
-            end: new Date('2026-04-06T23:59:59Z').valueOf(),
+            start: new Date(2026, 3, 6).valueOf(),
+            end: new Date(2026, 3, 6, 23, 59, 59).valueOf(),
         });
         (spectator.service as any)._report.set({
             business_days: 1,
diff --git a/apps/concierge/src/tests/staff/staff-listing.component.spec.ts b/apps/concierge/src/tests/staff/staff-listing.component.spec.ts
index 2a97cc9047..09d05be32d 100644
--- a/apps/concierge/src/tests/staff/staff-listing.component.spec.ts
+++ b/apps/concierge/src/tests/staff/staff-listing.component.spec.ts
@@ -27,6 +27,12 @@ describe('StaffListingComponent', () => {
 
     beforeEach(() => (spectator = createComponent()));
 
+    // The component schedules a 30ms timer that reads the document. This file
+    // finishes well inside that window, so without an explicit destroy the
+    // timer outlives the test environment and throws `document is not defined`
+    // during teardown, failing the whole run with every test passing.
+    afterEach(() => spectator?.fixture?.destroy());
+
     it('should create component', () => {
         expect(spectator.component).toBeTruthy();
     });