G'day Bugz,
You can use the core modules Time::Piece and Time::Seconds:
#!/usr/bin/env perl -l
use strict;
use warnings;
use Time::Piece;
use Time::Seconds;
my $date1 = "2014/01/25 23:11:14";
my $date2 = "2014/01/26 00:30:37";
my $format = '%Y/%m/%d %H:%M:%S';
my $t0 = Time::Piece->strptime($date1, $format);
my $t1 = Time::Piece->strptime($date2, $format);
my $diff = $t1 - $t0;
my $mins = int $diff->minutes;
my $secs = $diff - $mins * 60;
print "Minutes: $mins";
print "Seconds: $secs";
Output:
Minutes: 79
Seconds: 23