How can I change the timezone of a datetime value in Perl?

Question

Using this function:

perl -e 'use Time::Local; print timelocal("00","00","00","01","01","2000"),"\n";'

It will return an epochtime - but only in GMT - if i want the result in GMT+1 (which is the systems localtime(TZ)), what do i need to change?

Thanks in advance,

Anders

Answer 1

use DateTime;
my $dt   = DateTime->now;
$dt->set_time_zone( 'Europe/Madrid' );

Answer 2

There is only one standard definition for epochtime, based on UTC, and not different epochtimes for different timezones.

If you want to find the offset between gmtime and localtime, use

use Time::Local;
@t = localtime(time);
$gmt_offset_in_seconds = timegm(@t) - timelocal(@t);

Answer 3

While Time::Local is a reasonable solution, you may be better off using the more modern DateTime object oriented module. Here's an example:

use strict;
use DateTime;
my $dt = DateTime->now;
print $dt->epoch, "\n";

For the timezones, you can use the DateTime::TimeZone module.

use strict;
use DateTime;
use DateTime::TimeZone;

my $dt = DateTime->now;
my $tz = DateTime::TimeZone->new(name => "local");

$dt->add(seconds => $tz->offset_for_datetime($dt));

print $dt->epoch, "\n";

CPAN Links:

DateTime