Perl Programming/Keywords/gmtime

The gmtime keyword
gmtime works similar to localtime, except that the returned values are localized for the standard Greenwich Time Zone. If EXPRESSION has been omitted, content of $_ is used instead. When called in list context, the last value returned by gmtime ($isdst: is daylight saving time) is always 0, as there is no daylight saving time for GMT.

Examples
The code Note that daylight saving time is not present in February.