Merge branch '6400-php8-dateformat' into 'develop'

Match conversion from strftime to date got php 8

See merge request ispconfig/ispconfig3!1652

server/lib/classes/cron.inc.php

@@ -204,7 +204,7 @@ class cron {
 		if($this->_bParsed == false) $this->_calcValidValues();
 
 		// get the field values for the given Date.
-		list($iMinute, $iHour, $iDay, $iWDay, $iMonth, $iYear) = explode(':', ISPConfigDateTime::to_string($vDate, 'custom:%M:%H:%d:%w:%m:%Y'));
+		list($iMinute, $iHour, $iDay, $iWDay, $iMonth, $iYear) = explode(':', ISPConfigDateTime::to_string($vDate, 'custom:i:G:j:w:n:Y'));
 
 		$bValid = false;
 		$iStartYear = $iYear;
@@ -244,7 +244,6 @@ class cron {
 			}
 
 			$ts = mktime($iHour, $iMinute, 0, $iMonth, $iDay, $iYear);
-			//print strftime('%d.%m.%Y (%A) %H:%M', $ts) . "\n";
 			//var_dump($iCurMinute, $iCurHour, $iCurDay, $iCurMonth, $iCurWDay, '--', $iNextMinute, $iNextHour, $iNextDay, $iNextMonth, $iNextWDay);
 			if(ISPConfigDateTime::last_day($iMonth, $iYear) >= $iDay && in_array($app->functions->intval(date('w', $ts)), $this->_aValidValues['weekday'], true) === true) {
 				$bValid = true;