$start_time = $year . '-' . $month .'-01 00:00:00';
$end_time = date('Y-m-d', strtotime($start_time. ' +1 month -1 day')).' 23:59:59';
$start_time = $year . '-' . $month .'-01 00:00:00';
$end_time = date('Y-m-d', strtotime($start_time. ' +1 month -1 day')).' 23:59:59';
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