gmtime - convert UNIX time into record or string using Greenwich time
gmtime EXPR
Converts a time as returned by the time function to a 9-element array with the time localized for the standard Greenwich time zone. Typically used as follows:
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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.