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<?php $endDate = strtotime('2015-03-30 12:20:00'); $endDate -= $endDate % 1800; $endDate = date('Y-m-d H:i:s', $endDate); $startDate = date('Y-m-d H:i:s', strtotime($endDate . " - 1800 seconds")); echo $startDate . ' - ' . $endDate;

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