Calendar event showing up the wrong timezone

I've just experienced a similar 'timezone' related problem today.

My timezone is set correctly in Outlook 2016 for Mac (15.11.2) - (UTC) Dublin, Edinburgh, Lisbon London and on my Mac - British Summer Time.  It's also set correctly in Office 365. (E3 edition)

I received the appointment below for 11am to 12noon today.  It shows as 12 noon to 1pm in my calendar, so I was an hour late for my meeting. Thankfully I arrived early so the impact was minimal.  If I open the appointment in Outlook it says it's from a different timezone - (UTC) Monrovia, Reykjavik. 

The calendar appointment originated from Lotus Notes.  When I open it in Apple Calendar it shows the correct time.  I have redacted the sender details and the other people invited.  Otherwise it's the same appointment I received.

BEGIN:VCALENDAR

X-LOTUS-CHARSET:UTF-8

VERSION:2.0

PRODID:-//Lotus Development Corporation//NONSGML Notes 8.5.3//EN_C

METHOD:REQUEST

BEGIN:VTIMEZONE

TZID:GMT

BEGIN:STANDARD

DTSTART:19501029T020000

TZOFFSETFROM:+0100

TZOFFSETTO:+0000

RRULE:FREQ=YEARLY;BYMINUTE=0;BYHOUR=2;BYDAY=-1SU;BYMONTH=10

END:STANDARD

BEGIN:DAYLIGHT

DTSTART:19500326T020000

TZOFFSETFROM:+0000

TZOFFSETTO:+0100

RRULE:FREQ=YEARLY;BYMINUTE=0;BYHOUR=2;BYDAY=-1SU;BYMONTH=3

END:DAYLIGHT

END:VTIMEZONE

BEGIN:VEVENT

DTSTART;TZID="GMT":20150716T110000

DTEND;TZID="GMT":20150716T120000

TRANSP:OPAQUE

DTSTAMP:20150714T160527Z

SEQUENCE:0

ATTACH:CID:1__=0FBBF411DFCBB6808f9e8a93df938690918c0FB@

ATTENDEE;ROLE=CHAIR;PARTSTAT=ACCEPTED;CN=“REDACTED”

 ;RSVP=FALSE:mailto:******@redacted.com

ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE

 :mailto:******@brightconsult.co.uk

ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION

 ;CN=“Redacted”;RSVP=TRUE:mailto:******@redacted.com

ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION

 ;CN=“Redacted”;RSVP=TRUE

 :mailto:******@redacted.com

ATTENDEE;CUTYPE=ROOM;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION

 ;CN="Room 9";RSVP=TRUE

 :mailto:Room_******@redacted.com

CLASS:PUBLIC

DESCRIPTION;ALTREP="CID:<FFFF__=0FBBF411DFCBB6808f9e8a93df938690918c0FB@>":

SUMMARY:Meet with Dan Simms from Bright IT Consultancy Ltd

LOCATION:Redated

ORGANIZER;CN=“Redacted”;SENT-BY="mailto

 :@redacted.com":mailto:@redacted.com

UID:8B849CA497D903DB80257E8200583010-Lotus_Notes_Generated

X-LOTUS-BROADCAST:FALSE

X-LOTUS-UPDATE-SEQ:1

X-LOTUS-UPDATE-WISL:$S:1;$L:1;$B:1;$R:1;$E:1;$W:1;$O:1;$M:1;RequiredAttendees:1;INetRequiredNames:1;AltRequiredNames:1;StorageRequiredNames:1;OptionalAttendees:1;INetOptionalNames:1;AltOptionalNames:1;StorageOptionalNames:1

X-LOTUS-NOTESVERSION:2

X-LOTUS-NOTICETYPE:I

X-LOTUS-APPTTYPE:3

X-LOTUS-CHILD-UID:8B849CA497D903DB80257E8200583010

END:VEVENT

END:VCALENDAR

The sender hasn't experienced any problems previously.  Equally, I haven't experienced any problems previously either.  The difference seems to be that I've started using Outlook 2016 for Mac and I believe that's where the bug is.  Any thoughts?

Kind regards

Dan Simms

Bright IT Consultancy Limited

Daniel, how did you produce this .ics file? It doesn't look the same as one created by dragging a meeting from the calendar to Mac desktop.

I double clicked the appointment in my calendar.  There was a .ics attachment in there, so I dragged that to my desktop.  I then opened it in Mac TextEdit and redacted the e-mail addresses, taking care not to change anything else.  When I open this .ics file in Outlook it displays alongside the original appointment, with the incorrect time.

Daniel,

It looks like the issue here is that Lotus Notes says the meeting is in the GMT time zone, which technically does not have Daylight Savings Time, rather than "(UTC) London..." which does adjust for British Summer Time.  We're going to have to evaluate this further to see if there is a workable solution.