function notifytimesRange($advance) {
$start = date('Y-m-d H:i:s', max(strtotime("NOW"), strtotime($this->dtstart)));
- $end = date('Y-m-d H:i:s', min(strtotime("NOW + $advance DAYS"), strtotime($this->dtend)));
+ $end = min( new DateTime("NOW + $advance DAYS"), new DateTime($this->dtend ) )->format('Y-m-d H:i:s');
return array($start, $end);
}