diff --git a/Tests/lib/utilities.js b/Tests/lib/utilities.js
index d5904fd98..c49e112b0 100644
--- a/Tests/lib/utilities.js
+++ b/Tests/lib/utilities.js
@@ -192,7 +192,27 @@ class TestUtility {
     const vevent = new ICAL.Component('vevent')
     const now = new Date()
     const later = new Date(now.getTime() + 1000*60*60) // event lasts one hour
+    const vtimezone = ICAL.Component.fromString(`BEGIN:VTIMEZONE
+TZID:America/Toronto
+LAST-MODIFIED:20210303T135712Z
+X-LIC-LOCATION:America/Toronto
+BEGIN:DAYLIGHT
+TZNAME:EDT
+TZOFFSETFROM:-0500
+TZOFFSETTO:-0400
+DTSTART:19700308T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZNAME:EST
+TZOFFSETFROM:-0400
+TZOFFSETTO:-0500
+DTSTART:19701101T020000
+RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
+END:STANDARD
+END:VTIMEZONE`)
 
+    vcalendar.addSubcomponent(vtimezone)
     vcalendar.addSubcomponent(vevent)
     vevent.addPropertyWithValue('uid', uid)
     vevent.addPropertyWithValue('summary', summary)
diff --git a/Tests/spec/CalDAVSchedulingSpec.js b/Tests/spec/CalDAVSchedulingSpec.js
index 8f0b4b58d..528366852 100644
--- a/Tests/spec/CalDAVSchedulingSpec.js
+++ b/Tests/spec/CalDAVSchedulingSpec.js
@@ -463,8 +463,8 @@ describe('CalDAV Scheduling', function() {
     veventException.addPropertyWithValue('transp', 'OPAQUE')
     veventException.addPropertyWithValue('description', 'Exception')
     veventException.addPropertyWithValue('sequence', '1')
-    veventException.addProperty(vevent.getFirstProperty('dtstart'))
-    veventException.addProperty(vevent.getFirstProperty('dtend'))
+    veventException.addProperty(ICAL.Property.fromString(vevent.getFirstProperty('dtstart').toICALString()))
+    veventException.addProperty(ICAL.Property.fromString(vevent.getFirstProperty('dtend').toICALString()))
     // out of laziness, add the exception for the first occurence of the event
     recurrenceId = new ICAL.Property('recurrence-id')
     recurrenceId.setParameter('tzid', originalStartDate.timezone)
@@ -530,14 +530,14 @@ describe('CalDAV Scheduling', function() {
     expect(veventException.getAllProperties('attendee').length).toBe(1)
 
     // 5. Make sure organizer got the accept for the exception and
-	  // that the attendee is still declined in the master
+    // that the attendee is still declined in the master
     attendee = veventException.getAllProperties('attendee')[0]
     expect(attendee.getParameter('partstat'))
       .withContext('Partstat of attendee in the calendar of the organizer')
       .toBe('ACCEPTED')
 
     // 6. delete the attendee from the organizer event (uninvite)
-	  //    The event should be deleted from the attendee's calendar
+    //    The event should be deleted from the attendee's calendar
     vcalendarOrganizer.removeSubcomponent(veventException)
     await _putEvent(webdav, userCalendar, icsName, vcalendarOrganizer, 204)
     await _getEvent(webdavAttendee1, attendee1Calendar, icsName, 404)
@@ -554,7 +554,7 @@ describe('CalDAV Scheduling', function() {
     const icsName = 'test-rrule-invitation-deleted-exdate-dance.ics'
     icsList.push(icsName)
 
-    let summary, uid, rrule, recur, organizer, attendees, attendee, nstartdate, exdate, tzid, timezone, offset
+    let summary, uid, rrule, recur, organizer, attendees, attendee, nstartdate, exdate, tzid, timezone, offset, offsetException
     let vcalendar, vtimezone, vcalendarOrganizer, vcalendarAttendee, vevent, vevents, veventMaster, veventException
 
     await _deleteEvent(webdav, userCalendar + icsName)
@@ -616,6 +616,10 @@ describe('CalDAV Scheduling', function() {
     // 5. Create an exdate in the attendee's calendar
     exdate = nstartdate.convertToZone(ICAL.Timezone.utcTimezone)
     exdate.addDuration(new ICAL.Duration({ days: 2, seconds: -offset }))
+    offsetException = timezone.utcOffset(exdate)
+    if (offset != offsetException)
+      // Adjust for Daylight Saving Time
+      exdate.addDuration(new ICAL.Duration({ seconds: (offset-offsetException) }))
     vevent.addPropertyWithValue('exdate', exdate)
     vevent.removeProperty('last-modified')
     vevent.addProperty(utility.createDateTimeProperty('last-modified'))