The are many ways as usual. One example:

use Time::localtime;
$tm = localtime($time); 
printf("Dateline: %02d:%02d:%02d-%04d/%02d/%02d\n",
$tm->hour, $tm->min, $tm->sec, $tm->year+1900,
$tm->mon+1, $tm->mday);
[download]

This gives the time in your local timezone. If you rather have GMT use the gmtime function.

Bless the Perl Cookbook. If you perform a Super Search you will find many examples. Also on CPAN there are many modules to work with date/times.

Hope this helps.