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<?php $minutes = 5; $date = new DateTime('2001-01-01 01:01:60'); echo $dt->minute(floor($dt->minute/$minutes) * $minutes)->format('Y-m-d H:i:s') . "\n"; echo $dt->minute(ceil($dt->minute/$minutes) * $minutes)->format('Y-m-d H:i:s') . "\n";

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48.63 ms | 402 KiB | 5 Q