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    ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) =
                                            gmtime(time);

All array elements are numeric, and come straight out of a struct tm. In particular this means that $mon has the range 0..11 and $wday has the range 0..6 with sunday as day 0. Also, $year is the number of years since 1900, not simply the last two digits of the year.

If EXPR is omitted, does gmtime(time()).

In a scalar context, returns the ctime(3) value:

    $now_string = gmtime;  # e.g., "Thu Oct 13 04:54:34 1994"

Also see the timegm() function provided by the Time::Local module, and the strftime(3) function available via the POSIX module.