Date format changes

Hi friends, how can i establish date format like DD MM YYYY hh:mm, i have changed init.php but don´t find where to find the datetimepicker to change the format in Compose message menu option.

// set global date/time variables
$date_format = ‘d-m-Y’; <-----------
$time_format = ‘H:i:s’;
$datetime_format = $date_format . ’ ’ . $time_format;
$date_now = date($date_format, time());
$time_now = date($time_format, time());
$datetime_now = date($datetime_format, time());
$datetime_format_stamp = ‘dmYHis’; <------------
$datetime_now_stamp = date($datetime_format_stamp, time());

$core_config[‘datetime’][‘format’] = $datetime_format;
$core_config[‘datetime’][‘now_stamp’] = $datetime_now_stamp;

does this date format change alter any functionality in playsms?

Thanks and good weekend.