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Since you want to filter an array, I suggest array_filter() $times = [ '2021-06-02T19:40:00Z', '2021-06-03T02:10:00Z', '2021-06-03T01:10:00Z', '2021-06-02T23:05:00Z', '2021-06-02T23:05:00Z', '2021-06-02T23:07:00Z', '2021-06-02T23:20:00Z', '2021-06-02T18:20:00Z', '2021-06-03T00:10:00Z', '2021-06-03T00:40:00Z' ]; $d = new DateTime('23:59:59', new DateTimeZone('Z')); $newtimes = array_filter($times, function($v) use ($d) { return new DateTime($v) <= $d; });