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<?php $from = new DateTime('1970-01-01 22:00:00'); $to = (clone $from); $to->modify('+5 hours'); $dp = new DatePeriod($from, new DateInterval('P1H'), $to); $r = array(); foreach ($dp as $d) { $r[] = $d->format('hA'); } print_r($r);

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59.67 ms | 402 KiB | 5 Q