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@ 2019-08-24T17:36:44Z

<?php

foreach (DateTimeZone::listIdentifiers() as $tz) {
    date_default_timezone_set($tz);
    $date1 = new \DateTime('2019-09-24 11:47:24');
    $date2 = new \DateTime('2019-08-21 12:47:24');
    $diff = $date1->diff($date2);
    
    if ($diff->h < 0) {
        echo $tz, PHP_EOL;
    }
}

Output
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date_default_timezone_set: documentation ( source)

preferences:dark modelive preview

58.15 ms | 402 KiB | 5 Q