#! /usr/bin/perl -l

use strict ;
use warnings ;
use POSIX 'strftime';

my $a = time() ; # local time is now 12:35:00 


print "input time is $a" ;

print "gmtime gives: ".gmtime($a) ;

my $b = strftime("%s", gmtime(int $a)) ; # %s converts date to epoch 

print "diff is: ".($a - $b) ;