perldoc -f time
time Returns the number of non-leap seconds since whatever time the
system considers to be the epoch (that's 00:00:00, January 1,
1904 for MacOS, and 00:00:00 UTC, January 1, 1970 for most other
systems). Suitable for feeding to "gmtime" and "localtime".
For measuring time in better granularity than one second, you
may use either the Time::HiRes module from CPAN, or if you have
gettimeofday(2), you may be able to use the "syscall" interface
of Perl, see the perlfaq8 manpage for details.
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