/**
* Returns a set of html select-tags (one for year, month, day, hour, and minute) pre-selected with the +datetime+.
*/
static function select_datetime($datetime = null, $options = array())
{
$datetime = empty($datetime) ? Ak::getDate() : $datetime;
return AkDateHelper::select_date($datetime, $options) . AkDateHelper::select_time($datetime, $options);
}