Account for subsecond values when adding to Time

Fixes #252

Author: jhpratt

CHANGELOG.md

@@ -7,6 +7,13 @@ Versioning].
 
 ---
 
+## 0.2.14 [2020-05-02]
+
+### Fixed
+
+Adding/subtracting a `core::time::Duration` now correctly takes subsecond
+values into account. This also affects `PrimitiveDateTime` and `OffsetDateTime`.
+
 ## 0.2.13 [2020-05-01]
 
 ### Fixed

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "time"
-version = "0.2.13"
+version = "0.2.14"
 authors = ["Jacob Pratt <[email protected]>"]
 edition = "2018"
 repository = "https://github.com/time-rs/time"

src/time_mod.rs

@@ -686,7 +686,8 @@ impl Add<StdDuration> for Time {
     /// ```
     #[inline(always)]
     fn add(self, duration: StdDuration) -> Self::Output {
-        self + Duration::seconds((duration.as_secs() % 86_400) as i64)
+        self + Duration::try_from(duration)
+            .expect("overflow converting `core::time::Duration` to `time::Duration`")
     }
 }
 
@@ -770,7 +771,8 @@ impl Sub<StdDuration> for Time {
     /// ```
     #[inline(always)]
     fn sub(self, duration: StdDuration) -> Self::Output {
-        self - Duration::seconds((duration.as_secs() % 86_400) as i64)
+        self - Duration::try_from(duration)
+            .expect("overflow converting `core::time::Duration` to `time::Duration`")
     }
 }
 
@@ -1234,6 +1236,10 @@ mod test {
 
     #[test]
     fn add_std_duration() -> crate::Result<()> {
+        assert_eq!(
+            time!(0:00) + 1.std_milliseconds(),
+            time!(0:00:00:001_000_000)
+        );
         assert_eq!(time!(0:00) + 1.std_seconds(), time!(0:00:01));
         assert_eq!(time!(0:00) + 1.std_minutes(), time!(0:01));
         assert_eq!(time!(0:00) + 1.std_hours(), time!(1:00));
@@ -1264,6 +1270,10 @@ mod test {
         assert_eq!(time!(12:00) - 1.std_hours(), time!(11:00));
 
         // Underflow
+        assert_eq!(
+            time!(0:00) - 1.std_milliseconds(),
+            time!(23:59:59:999_000_000)
+        );
         assert_eq!(time!(0:00) - 1.std_seconds(), time!(23:59:59));
         assert_eq!(time!(0:00) - 1.std_minutes(), time!(23:59));
         assert_eq!(time!(0:00) - 1.std_hours(), time!(23:00));