Fixes #5369 Internal ISPConfig cronjobs are not run in 3.1-dev version

install/sql/incremental/upd_dev_collection.sql

@@ -35,3 +35,5 @@ ALTER TABLE `ftp_user` CHANGE COLUMN `password` `password` VARCHAR(200) DEFAULT
 ALTER TABLE `shell_user` CHANGE COLUMN `password` `password` VARCHAR(200) DEFAULT NULL;
 ALTER TABLE `sys_user` CHANGE COLUMN `passwort` `passwort` VARCHAR(200) DEFAULT NULL;
 ALTER TABLE `webdav_user` CHANGE COLUMN `password` `password` VARCHAR(200) DEFAULT NULL;
+
+DELETE FROM sys_cron WHERE `next_run` IS NOT NULL AND `next_run` >= DATE_ADD(`last_run`, INTERVAL 30 DAY) AND `next_run` BETWEEN '2020-01-01' AND '2020-01-02';

server/lib/classes/cron.inc.php

@@ -265,8 +265,8 @@ class cron {
 
 		reset($this->_aValidValues[$sField]);
 		foreach($this->_aValidValues[$sField] as $cur) {
-			if($bIncludeCurrent == true && $cur['value'] >= $iValue) return $cur['value'];
-			elseif($cur['value'] > $iValue) return $cur['value'];
+			if($bIncludeCurrent == true && $cur >= $iValue) return $cur;
+			elseif($cur > $iValue) return $cur;
 		}
 		return reset($this->_aValidValues[$sField]);
 	}