Add seconds() method to Timestamp

Author: ethanfrey

packages/std/src/timestamp.rs

@@ -42,14 +42,21 @@ impl Timestamp {
     }
 
     /// Returns nanoseconds since epoch
+    #[inline]
     pub fn nanos(&self) -> u64 {
         self.0.u64()
     }
+
+    /// Returns seconds since epoch (truncate nanoseconds)
+    #[inline]
+    pub fn seconds(&self) -> u64 {
+        self.0.u64() / 1_000_000_000
+    }
 }
 
 impl fmt::Display for Timestamp {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let whole = self.nanos() / 1_000_000_000;
+        let whole = self.seconds();
         let fractional = self.nanos() % 1_000_000_000;
         write!(f, "{}.{:09}", whole, fractional)
     }
@@ -131,6 +138,14 @@ mod tests {
         assert_eq!(sum.nanos(), 0);
     }
 
+    #[test]
+    fn timestamp_seconds() {
+        let sum = Timestamp::from_nanos(987654321000);
+        assert_eq!(sum.seconds(), 987);
+        let sum = Timestamp::from_seconds(1234567).plus_nanos(8765436);
+        assert_eq!(sum.seconds(), 1234567);
+    }
+
     #[test]
     fn timestamp_implements_display() {
         let embedded = format!("Time: {}", Timestamp::from_nanos(0));