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@ 2017-07-13T12:17:43Z

<?php

$a = strtotime('2017-07-13');
$b= strtotime('2017-07-13 4:00PM');

print ($b-$a)/3600;

Output
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strtotime: documentation ( source)

preferences:dark modelive preview

40.41 ms | 402 KiB | 5 Q