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<?php $startDate = new DateTime('@' . mktime(0, 0, 0, date("m"), date("d") - 7, date("Y"))); $optionalStartDate = '2018-01-01 00:00:00'; print_r(strtotime($optionalStartDate)); print_r($startDate);

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37.2 ms | 402 KiB | 5 Q