Or try Date::Calc for similar effect as the previous response.

#!/usr/bin/env perl
#
use strict;
use warnings;
use Date::Calc qw/ Mktime /;

my $date1 = "Aug 26 23:10:59";
my $date2 = "Aug 27 10:59:02";

# assume that the year needed is 2007;
my $year1 = my $year2 = 2007;

sub split_date_str {
    my %months = ( Jan => 1, Feb => 2, Mar => 3, Apr => 4, May => 5, J
+un => 6,
                   Jul => 7, Aug => 8, Sep => 9, Oct => 10, Nov => 11,
+ Dec => 12 );
    my $str = shift;
    my @f = split /\s+/, $str;
    my $month = $months{$f[0]} || die "invalid month in string: '$str'
+\n";
    ($month, $f[1], split(/:/, $f[2]));
}

my $diff = Mktime( $year2, split_date_str($date2) )  - Mktime( $year1,
+ split_date_str($date1) );
print $diff,"\n";
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