<?php
$diff = date_diff($date1,$date2);
$hour = ($diff->d * 24) + $diff->h;
echo $hour;
PD9waHAKJGRhdGUxID0gZGF0ZV9jcmVhdGUoJzIwMTctMDctMDMgMTM6NTU6MjAnKTsKJGRhdGUyID0gZGF0ZV9jcmVhdGUoJzIwMTctMDctMDQgMjE6MTc6NDQnKTsKCiRkaWZmID0gZGF0ZV9kaWZmKCRkYXRlMSwkZGF0ZTIpOwoKJGhvdXIgPSAoJGRpZmYtPmQgKiAyNCkgKyAkZGlmZi0+aDsKZWNobyAkaG91cjs=