1 use std::time::{Duration, Instant, SystemTime};
2 
main()3 fn main() {
4     let then = Instant::now();
5 
6     assert_eq!(Duration::from_secs(42), then.elapsed());
7 
8     assert_eq!(
9         SystemTime::UNIX_EPOCH + Duration::new(1431648000, 100),
10         SystemTime::now()
11     );
12 }
13