Convert Date to DB Date Format

$input_date = date('d M Y h:i A'); 
echo $input_date; //01 Jun 2015 07:31 AM

$input_date_timestamp = strtotime($input_date);

$new_date = date('Y-m-d H:i:s', $input_date_timestamp); 
echo $new_date; //2015-06-01 07:31:00
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