diff --git a/modules/default/calendar/calendarfetcher.js b/modules/default/calendar/calendarfetcher.js
index c12dfb1d..b7f89b1d 100644
--- a/modules/default/calendar/calendarfetcher.js
+++ b/modules/default/calendar/calendarfetcher.js
@@ -236,7 +236,7 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 
 						// Loop through the set of date entries to see which recurrences should be added to our event list.
 						for (let d in dates) {
-							const date = dates[d];
+							let date = dates[d];
 							// ical.js started returning recurrences and exdates as ISOStrings without time information.
 							// .toISOString().substring(0,10) is the method they use to calculate keys, so we'll do the same
 							// (see https://github.com/peterbraden/ical.js/pull/84 )
@@ -409,24 +409,30 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 				}
 			}
 			if (debug) Log.log("corrected tz=" + event.start.tz);
+			let mmo = 0;  // offset  from TZ string or calculated
+			let mm = 0;   // date with tz or offset
+			let mms = 0;  // utc offset of created with tz
 			// if there is still an offset, lookup failed, use it
 			if (event.start.tz.startsWith("(")) {
 				const regex = /[+|-]\d*:\d*/;
-				offset = event.start.tz.match(regex).toString();
-				if (debug) Log.log("ical offset=" + offset);
+				mms=mmo = event.start.tz.match(regex).toString();
+				if (debug) Log.log("ical offset=" + mmo);
+				mm = moment.tz(moment(date));
+				mm.utcOffset(mmo)
 			}
+			else {
+				// get the start time in that timezone
+				if (debug) Log.log("ttttttt=" + moment(event.start).toDate());
+				mms = moment.tz(moment(event.start), event.start.tz).utcOffset();
+				if (debug) Log.log("ms offset=" + mms);
 
-			// get the start time in that timezone
-			if (debug) Log.log("ttttttt=" + moment(event.start).toDate());
-			let mms = moment.tz(moment(event.start), event.start.tz).utcOffset();
-			if (debug) Log.log("ms offset=" + mms);
+				if (debug) Log.log("start date =" + moment.tz(moment(event.start), event.start.tz).toDate());
 
-			if (debug) Log.log("start date =" + moment.tz(moment(event.start), event.start.tz).toDate());
-
-			// get the specified date in that timezone
-			let mm = moment.tz(moment(date), event.start.tz);
-			if (debug) Log.log("mm=" + mm.toDate());
-			let mmo = mm.utcOffset();
+				// get the specified date in that timezone
+			  mm = moment.tz(moment(date), event.start.tz);
+				if (debug) Log.log("mm=" + mm.toDate());
+				mmo = mm.utcOffset();
+			}
 			if (debug) Log.log("mm ofset=" + mmo + " hour=" + mm.format("H") + " event date=" + mm.toDate());
 			// if the offset is greater than 0, east of london
 			if (mmo > 0) {
@@ -434,7 +440,7 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 				if (debug) Log.log("offset");
 				let h = parseInt(mm.format("H"));
 				// check if the event time is less than the offset
-				if (h > 0 && h < Math.abs(mmo) / 60) {
+				if (h > 0 && h < (Math.abs(mmo) / 60)) {
 					// if so, rrule created a wrong date (utc day, oops, with utc yesterday adjusted time)
 					// we need to fix that
 					adjustHours = 24;