diff --git a/modules/default/calendar/calendarfetcher.js b/modules/default/calendar/calendarfetcher.js
index bb3c4daa..f153f7c0 100644
--- a/modules/default/calendar/calendarfetcher.js
+++ b/modules/default/calendar/calendarfetcher.js
@@ -110,7 +110,7 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 				if (event.type === "VEVENT") {
 					let startDate = eventDate(event, "start");
 					let endDate;
-
+					// console.log("\nevent="+JSON.stringify(event))
 					if (typeof event.end !== "undefined") {
 						endDate = eventDate(event, "end");
 					} else if (typeof event.duration !== "undefined") {
@@ -212,8 +212,9 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 							pastLocal = pastMoment.subtract(past.getTimezoneOffset(), "minutes").toDate();
 							futureLocal = futureMoment.subtract(future.getTimezoneOffset(), "minutes").toDate();
 						}
-						const dates = rule.between(pastLocal, futureLocal, true, limitFunction);
 
+						const dates = rule.between(pastLocal, futureLocal, true, limitFunction);
+						// console.log("title="+event.summary.val+" dates="+JSON.stringify(dates))
 						// The "dates" array contains the set of dates within our desired date range range that are valid
 						// for the recurrence rule. *However*, it's possible for us to have a specific recurrence that
 						// had its date changed from outside the range to inside the range.  For the time being,
@@ -242,42 +243,50 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 							let showRecurrence = true;
 
 							startDate = moment(date);
+							// console.log("now timezone="+ moment.tz.guess());
 							// whether we need to adjust for RRULE returning the wrong date, with the right time (forward of URC timezones)
-							let adjustHours = 0;
+							let adjustDays = 0;
 							// if a timezone was specified
 							if (!event.start.tz) {
-								// guess at one
 								event.start.tz = moment.tz.guess();
 							}
-							// if there is a timezone
+							// console.log("tz="+event.start.tz)
 							if (event.start.tz) {
-								// if it contains a space, it is windows,
+								// if this is a windows timezone
 								if (event.start.tz.indexOf(" ") > 0) {
-									// get the IANA name string from hash
-									event.start.tz = getIanaTZFromMS(event.start.tz);
+									// use the lookup table to get theIANA name as moment and date don't know MS timezones
+									let tz = getIanaTZFromMS(event.start.tz);
+									// watch out for unregistered windows timezone names
+									// if we had a successfule lookup
+									if (tz) {
+										// change the timezone to the IANA name
+										event.start.tz = getIanaTZFromMS(event.start.tz);
+										// console.log("corrected timezone="+event.start.tz)
+									}
 								}
-								// get the offset of the start date/time
+								// get the start time in that timezone
 								let mms = moment.tz(moment(event.start), event.start.tz).utcOffset();
-								// get the specified recurring date/time in that timezone
+								// console.log("ms offset="+mms)
+								// get the specified date in that timezone
 								let mm = moment.tz(moment(date), event.start.tz);
-								// and its offset
 								let mmo = mm.utcOffset();
+								// console.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) {
-									// get the hour for the recurring date/time
 									let h = parseInt(mm.format("H"));
 									// check if the event time is less than the offset
 									if (h > 0 && h < mmo / 60) {
 										// if so, rrule created a wrong date (utc day, oops, with utc yesterday adjusted time)
 										// we need to fix that
-										adjustHours = 24;
+										adjustDays = 24;
+										// console.log("adjusting date")
 									}
-									// did the daylight savings offset change from start to now?
-									// fix it
 									if (mmo > mms) {
-										adjustHours += 1;
+										adjustDays += 1;
+										// console.log("adjust up 1 hour dst change")
 									} else if (mmo < mms) {
-										adjustHours -= 1;
+										adjustDays -= 1;
+										//console.log("adjust down 1 hour dst change")
 									}
 								}
 							}
@@ -295,6 +304,8 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 								showRecurrence = false;
 							}
 
+							//console.log("duration="+duration)
+
 							endDate = moment(parseInt(startDate.format("x")) + duration, "x");
 							if (startDate.format("x") === endDate.format("x")) {
 								endDate = endDate.endOf("day");
@@ -316,8 +327,8 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 								addedEvents++;
 								newEvents.push({
 									title: recurrenceTitle,
-									startDate: (adjustHours ? startDate.subtract(adjustHours, "hours") : startDate).format("x"),
-									endDate: (adjustHours ? endDate.subtract(adjustHours, "hours") : endDate).format("x"),
+									startDate: (adjustDays ? startDate.subtract(adjustDays, "hours") : startDate).format("x"),
+									endDate: (adjustDays ? endDate.subtract(adjustDays, "hours") : endDate).format("x"),
 									fullDayEvent: isFullDayEvent(event),
 									recurringEvent: true,
 									class: event.class,
@@ -332,7 +343,7 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 					} else {
 						// Single event.
 						const fullDayEvent = isFacebookBirthday ? true : isFullDayEvent(event);
-
+						// console.log("full day event")
 						if (includePastEvents) {
 							// Past event is too far in the past, so skip.
 							if (endDate < past) {
@@ -365,6 +376,7 @@ const CalendarFetcher = function (url, reloadInterval, excludedEvents, maximumEn
 						}
 						// if the start and end are the same, then make end the 'end of day' value (start is at 00:00:00)
 						if (fullDayEvent && startDate.format("x") === endDate.format("x")) {
+							//console.log("end same as start")
 							endDate = endDate.endOf("day");
 						}