uuid_time - extract the time at which the UUID was created
time_t uuid_time(uuid_t uu, struct timeval *ret_tv)
The uuid_time function extracts the time at which the supplied time-based
UUID uu was created. Note that the UUID creation time is only encoded
within certain types of UUIDs. This function can only reasonably expect to
extract the creation time for UUIDs created with the
uuid_generate_time(3) and uuid_generate_time_safe(3) functions.
It may or may not work with UUIDs created by other mechanisms.
The time at which the UUID was created, in seconds since January 1, 1970 GMT
(the epoch), is returned (see time(2)). The time at which the UUID was
created, in seconds and microseconds since the epoch, is also stored in the
location pointed to by ret_tv (see gettimeofday(2)).