You should be storing UTC time (also known as GMT) so that all of your timeframes are common across all timezones for consistency. Then, when you need to show the users their time - you can convert from GMT to localtime.
You can get the gmtime in seconds by using the Time::Local module. Here is a snippet that you can use to show how to do the time conversions:
my $time = time();
my $timegm = timegm(gmtime($time));
my $gmt = gmtime($time);
my $timelocal = timelocal(localtime($time));
my $lmt = localtime($time);
print "TIME: [$time]\n";
print "GMT: [$timegm]\n";
print "GMT AS TEXT: [$gmt]\n";
print "LOCALTIME: [$timelocal]\n";
print "LOCALTIME AS TEXT: [$lmt]\n";
To get the localtime of GMT use the seconds value of the gmtime in localtime
my $timelocal = timelocal(gmtime($timegm));
my $lmt = localtime($timegm);
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