wstd::time::SystemTime can be converted to std::time::SystemTime (#120)

Author: pchickey

src/time/mod.rs

@@ -22,7 +22,8 @@ use crate::{
 };
 
 /// A measurement of the system clock, useful for talking to external entities
-/// like the file system or other processes.
+/// like the file system or other processes. May be converted losslessly to a
+/// more useful `std::time::SystemTime` to provide more methods.
 #[derive(Debug, Clone, Copy)]
 #[allow(dead_code)]
 pub struct SystemTime(wall_clock::Datetime);
@@ -33,6 +34,14 @@ impl SystemTime {
     }
 }
 
+impl From<SystemTime> for std::time::SystemTime {
+    fn from(st: SystemTime) -> Self {
+        std::time::SystemTime::UNIX_EPOCH
+            + std::time::Duration::from_secs(st.0.seconds)
+            + std::time::Duration::from_nanos(st.0.nanoseconds.into())
+    }
+}
+
 /// An async iterator representing notifications at fixed interval.
 pub fn interval(duration: Duration) -> Interval {
     Interval { duration }