code optimized

 	/**

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

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

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

--- ./apps/dav/lib/CalDAV/Schedule/IMipPlugin.php	2022-07-04 12:41:03.228533600 +0530

+++ ./apps/dav/lib/CalDAV/Schedule/IMipPlugin-new.php	2022-07-04 12:31:43.728533600 +0530

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

 	 * @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'};

+		foreach( $vevent as $currentevent){

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

+			$dtstampTime = strtotime($dtstamp);

+			if($dtstampTime>$lastmodified){

+				$lastmodified=$dtstampTime;

+				$dtStartFinal= $vevent1->DTSTART;

+				$dtEndtFinal= $vevent1->DTEND;

+				$durationFinal= $vevent1->DURATION;

+				$dtStartFinal= $currentevent->DTSTART;

+				$dtEndtFinal= $currentevent->DTEND;

+				$durationFinal= $currentevent->DURATION;

+			}

+		}

+		$dtstart = $dtStartFinal;

 		}

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