Struct RealTimeInstant
sealed struct RealTimeInstant
Represents a point in time in the system’s clock. Useful for
talking to external entities like the file system or
other processes.
Distinct from the MonotonicInstant type, this time measurement is
not monotonic. This means that you can save a file to the file
system, then save another file to the file system, and the second
file has a RealTime measurement earlier than the first. In other
words, an operation that happens after another operation in real
world may have an earlier RealTimeInstant.
This is identical to Posix CLOCK_REALTIME.

