- // On rust prior to 1.60 `Instant::duration_since` will panic if time goes backwards.
- // We write `last_updated` as wallclock time even though its ultimately an `Instant` (which
- // is a time from a monotonic clock usually represented as an offset against boot time).
- // Thus, we have to construct an `Instant` by subtracting the difference in wallclock time
- // from the one that was written. However, because `Instant` can panic if we construct one
- // in the future, we must handle wallclock time jumping backwards, which we do by simply
- // using `Instant::now()` in that case.
- let wall_clock_now = T::duration_since_epoch();
- let now = T::now();
- let last_updated = if wall_clock_now > duration_since_epoch {
- now - (wall_clock_now - duration_since_epoch)
- } else { now };
-
- let offset_history_duration_since_epoch =
- offset_history_duration_since_epoch.unwrap_or(duration_since_epoch);
- let offset_history_last_updated = if wall_clock_now > offset_history_duration_since_epoch {
- now - (wall_clock_now - offset_history_duration_since_epoch)
- } else { now };