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Date/Time Functions Summary
Perl has relatively few date/time related functions. They can be categorized as follows:

Current Time	gmtime, localtime
Elapsed Time	time, times

Date/Time Function Reference
Here's a quick reference of the available date/time functions, in alphabetical order.

• gmtime - returns ($sec, $min, $hour, $mon, $year $wday, $yday, $isdate) for Greenwich time zone

      gmtime (expression)  # like localtime, but Greenwich time zone 
      

• localtime - returns ($sec, $min, $hour, $mon, $year $wday, $yday, $isdate)

      localtime(expression)
     ($s, $m, $h, $mon, $yr $wdy, $ydy, $isdate) = localtime(time);
     $year += 1900;                         # gets true year
     $year = sprintf("%02d", $year % 100);  # gets last 2 digits of year
     $now = localtime;     # scalar context gets "Thu Oct 13 04:54:34 1994"
      

  Note: all outputs are numeric and zero-based. $year is number of years since 1900.

• time - returns number of seconds since Jan 1, 1970

      $result = time       # result can be used by gmtime and localtime
      

• times - returns process/children elapsed time

      ($user, $system, $cuser, $csystem) = times
      $user = times        # scalar context returns only $user
      

High Resolution Timing
For improved resolution timing needs, use the Time::HiRes Module.

If you have any suggestions for additions to these tutorials, please let me know.