Version 4.3.3 * automatic sync over WorkManager (instead of sync framework) - sync now also works when Android thinks that "storage is low" * [CalDAV] improve compatibility with time zones with negative DST (like for rare Europe/Dublin events) * [WebDAV] fix time-zone issue with timestamps * [UI] added "Last sync" time to collection properties * improve mutual features with jtx Board * various bug fixes and improvements