2.1.1 Fixed Up Wallclock

This monotonic clock source is the most generally applicable implementation and should work across all supported platforms. It uses the standard wallclock as a clock source and then attempts to detect and correct for any user adjustments. This ensures that the clock source is monotonic, but it will increment at an unpredictable rate whenever adjustments to the wallclock are made. This is the default option since it is applicable to all platforms and is provided in the utilities package as FixedUpMonotonicClock.