DateTime() is better than strtotime()

I’m using Windows 64 bit and PHP 5.6

strtotime() can’t go beyond 2038 year

<?php
$number_of_years = 2;
$start_date = '2037-12-31';
$end_date = strtotime('+' . $number_of_years . ' year', strtotime($start_date));
$end_date = strtotime('-1 day', $end_date);
echo 'strtotime() Result: '.date('Y-m-d', $end_date);

echo "<br/>";

$d = new DateTime($start_date);
$d->modify("+".$number_of_years." year");
$d->modify("-1 day");
echo 'DateTime() Result: '.$d->format('Y-m-d');

Result:

strtotime() Result: 1969-12-31
DateTime() Result: 2039-12-30


Usage of DateTime() is also easier.