1 files changed, 75 insertions, 0 deletions
diff --git a/vendor/time/src/interop/utcdatetime_systemtime.rs b/vendor/time/src/interop/utcdatetime_systemtime.rs
new file mode 100644
index 00000000..7cfb44e1
--- /dev/null
+++ b/vendor/time/src/interop/utcdatetime_systemtime.rs
@@ -0,0 +1,75 @@
+use core::cmp::Ordering;
+use core::ops::Sub;
+use std::time::SystemTime;
+
+use crate::{Duration, UtcDateTime};
+
+impl Sub<SystemTime> for UtcDateTime {
+    type Output = Duration;
+
+    /// # Panics
+    ///
+    /// This may panic if an overflow occurs.
+    fn sub(self, rhs: SystemTime) -> Self::Output {
+        self - Self::from(rhs)
+    }
+}
+
+impl Sub<UtcDateTime> for SystemTime {
+    type Output = Duration;
+
+    /// # Panics
+    ///
+    /// This may panic if an overflow occurs.
+    fn sub(self, rhs: UtcDateTime) -> Self::Output {
+        UtcDateTime::from(self) - rhs
+    }
+}
+
+impl PartialEq<SystemTime> for UtcDateTime {
+    fn eq(&self, rhs: &SystemTime) -> bool {
+        self == &Self::from(*rhs)
+    }
+}
+
+impl PartialEq<UtcDateTime> for SystemTime {
+    fn eq(&self, rhs: &UtcDateTime) -> bool {
+        &UtcDateTime::from(*self) == rhs
+    }
+}
+
+impl PartialOrd<SystemTime> for UtcDateTime {
+    fn partial_cmp(&self, other: &SystemTime) -> Option<Ordering> {
+        self.partial_cmp(&Self::from(*other))
+    }
+}
+
+impl PartialOrd<UtcDateTime> for SystemTime {
+    fn partial_cmp(&self, other: &UtcDateTime) -> Option<Ordering> {
+        UtcDateTime::from(*self).partial_cmp(other)
+    }
+}
+
+impl From<SystemTime> for UtcDateTime {
+    fn from(system_time: SystemTime) -> Self {
+        match system_time.duration_since(SystemTime::UNIX_EPOCH) {
+            Ok(duration) => Self::UNIX_EPOCH + duration,
+            Err(err) => Self::UNIX_EPOCH - err.duration(),
+        }
+    }
+}
+
+impl From<UtcDateTime> for SystemTime {
+    fn from(datetime: UtcDateTime) -> Self {
+        let duration = datetime - UtcDateTime::UNIX_EPOCH;
+
+        if duration.is_zero() {
+            Self::UNIX_EPOCH
+        } else if duration.is_positive() {
+            Self::UNIX_EPOCH + duration.unsigned_abs()
+        } else {
+            debug_assert!(duration.is_negative());
+            Self::UNIX_EPOCH - duration.unsigned_abs()
+        }
+    }
+}