rust-lang/rust — pull request #18690 by 1-more (2014-11-06 12:56:43+00:00)
Title: libstd’s Duration refactor

This commit changes the internal representation of Duration from

pub struct Duraion {
secs: i64,
nanos: i32
}

to

pub struct Duration {
millis: i64, // Milliseconds
nanos: i32, // Nanoseconds, |nanos| < NANOS_PER_MILLI
}