Convert std::time::SystemTime to chrono::datetime::DateTime

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4

For now, use the following: (Same for DateTime<Local>)

fn system_time_to_date_time(t: SystemTime) -> DateTime<UTC> {
    let (sec, nsec) = match t.duration_since(UNIX_EPOCH) {
        Ok(dur) => (dur.as_secs() as i64, dur.subsec_nanos()),
        Err(e) => { // unlikely but should be handled
            let dur = e.duration();
            let (sec, nsec) = (dur.as_secs() as i64, dur.subsec_nanos());
            if nsec == 0 {
                (-sec, 0)
            } else {
                (-sec - 1, 1_000_000_000 - nsec)
            }
        },
    };
    UTC.timestamp(sec, nsec)
}

Chrono 0.3 would switch to std::time::SystemTime and std::time::Duration for the primary timekeeping, so hopefully this workaround will be gone.

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