use strict; use warnings; use Date::Parse; use Date::Calc qw/Localtime/; my $startDateTime = 'Dec 31 23:59:'; my $addMinutes = 2; my $year = ( Localtime(time) )[0]; $startDateTime .= '00 ' . $year; my $startSeconds = str2time($startDateTime); my $endSeconds = $startSeconds + $addMinutes * 60; print "\$startSeconds: $startSeconds; \$endSeconds: $endSeconds; Delta: " . ( $endSeconds - $startSeconds );