variable deifned

 	/**

--- ./apps/dav/lib/CalDAV/Schedule/IMipPlugin.php	2022-06-30 10:22:42.346419100 +0530

+++ ./apps/dav/lib/CalDAV/Schedule/IMipPlugin-new.php	2022-06-30 10:23:55.506419100 +0530

@@ -419,23 +419,34 @@

+++ ./apps/dav/lib/CalDAV/Schedule/IMipPlugin-new.php	2022-07-01 09:03:16.414034600 +0530

@@ -419,23 +419,37 @@

 	 * @param VEvent $vevent

 	 */

 	private function generateWhenString(IL10N $l10n, VEvent $vevent) {

-			$isFloating = $vevent->DTSTART->isFloating();

-			$dtend = clone $vevent->DTSTART;

+		$lastmodified=0;

+		$dtStartFinal= $vevent->DTSTART;

+		$dtEndtFinal= $vevent->DTEND;

+		$durationFinal= $vevent->DURATION;

+		foreach( $vevent as $vevent1){

+			$dtstamp= $vevent1->{'LAST-MODIFIED'};

+			$dtstampTime = strtotime($dtstamp);

 		}

 		$isAllDay = $dtstart instanceof Property\ICalendar\Date;