gmtime
gmtime EXPR
gmtime
Works just like localtime but the returned values are localized for the standard Greenwich time zone.
Note: When called in list context, $isdst, the last value returned by gmtime, is always 0
. There is no Daylight Saving Time in GMT.
Portability issues: gmtime in perlport.
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https://perldoc.perl.org/5.20.2/functions/gmtime.html