Its provides the most precise time that the underlying OS can achieve
(generally microseconds or nanoseconds). It also ensures monotonicity, which
means that the returned time can never go backward, even if the system time
is changed.
$(PARA The Duration value ($(I core.time.Duration)) returned by the clock can
then be converted to a number of seconds, milliseconds or even microseconds.)
Clock is a lightweight class for measuring time.
Its provides the most precise time that the underlying OS can achieve (generally microseconds or nanoseconds). It also ensures monotonicity, which means that the returned time can never go backward, even if the system time is changed.