Issue with Outlook recurring events

WallysWellies

@sdetweil because Microsoft? Not really sure.

I’ve been digging into the iCal stuff and I see the windowsZones.json file which I presume does your MS to IANA mapping. In there is this line:

"GMT Standard Time":{"iana":["Europe/London"]}

Is that what you were referring to - should this not replace the GMT timezone with the IANA equivalent? I’m just wading through code I only partially understand…!

I can ask a few people for sample icals to see if my GTM timezone is an oddity if that’s any use.

sdetweil

@WallysWellies can you add

stop MM

, "DEBUG"

to the logLevel value in config.js at the top
and then start MM in debug mode

cd ~/MagicMirror
npm start >somefile.txt 2>&1

wait til the calendar is up
then
ctrl-q on the MM screen to shut it down

then examine somefile.txt
(careful if posting, the debug log contains the full URL of the calendar from config.js)

WallysWellies

I think this is the relevant entry from the log:

[2025-10-07 07:52:10.434] [DEBUG] parsed data={
"040000008200E00074C5B7101A82E008000000004ECDB12BC10FDC01000000000000000010000000012DADF723AF8140B35A2E374506E8D9": {
    "type": "VEVENT",
    "params": [],
    "rrule": {
      "_cache": {
        "all": false,
        "before": [],
        "after": [],
        "between": []
      },
      "origOptions": {
        "tzid": "Europe/London",
        "dtstart": "2025-08-26T17:45:00.000Z",
        "freq": 2,
        "until": "2025-10-07T16:45:00.000Z",
        "interval": 1,
        "byweekday": [
          {
            "weekday": 1
          }
        ],
        "wkst": {
          "weekday": 0
        }
      },
      "options": {
        "freq": 2,
        "dtstart": "2025-08-26T17:45:00.000Z",
        "interval": 1,
        "wkst": 0,
        "count": null,
        "until": "2025-10-07T16:45:00.000Z",
        "tzid": "Europe/London",
        "bysetpos": null,
        "bymonth": null,
        "bymonthday": [],
        "bynmonthday": [],
        "byyearday": null,
        "byweekno": null,
        "byweekday": [
          1
        ],
        "bynweekday": null,
        "byhour": [
          17
        ],
        "byminute": [
          45
        ],
        "bysecond": [
          0
        ],
        "byeaster": null
      }
    },
    "exdate": [],
    "uid": "040000008200E00074C5B7101A82E008000000004ECDB12BC10FDC01000000000000000010000000012DADF723AF8140B35A2E374506E8D9",
    "summary": "My Event",
    "start": "2025-08-26T16:45:00.000Z",
    "datetype": "date-time",
    "end": "2025-08-26T17:30:00.000Z",
    "class": "PUBLIC",
    "priority": "5",
    "dtstamp": "2025-10-07T06:52:10.000Z",
    "transparency": "OPAQUE",
    "status": "CONFIRMED",
    "sequence": "0",
    "location": "",
    "MICROSOFT-CDO-APPT-SEQUENCE": "0",
    "MICROSOFT-CDO-BUSYSTATUS": "BUSY",
    "MICROSOFT-CDO-INTENDEDSTATUS": "BUSY",
    "MICROSOFT-CDO-ALLDAYEVENT": "FALSE",
    "MICROSOFT-CDO-IMPORTANCE": "1",
    "MICROSOFT-CDO-INSTTYPE": "1",
    "MICROSOFT-DONOTFORWARDMEETING": "FALSE",
    "MICROSOFT-DISALLOW-COUNTER": "FALSE",
    "MICROSOFT-REQUESTEDATTENDANCEMODE": "DEFAULT",
    "MICROSOFT-ISRESPONSEREQUESTED": "FALSE",
    "method": "PUBLISH"
  }
}]

The timezone does look to be getting updated to the IANA string. But line 33 has:

"until": "2025-10-07T16:45:00.000Z",

but the final event should be starting at 17:45 and ending at 18:30. So the ical does seem to imply that the series ends prior to the final event starting. Even if we account for the hour difference due to a potential timezone issue, the series is ending right as the final event starts.

Is there a particular part of the log that might be useful for digging deeper - a search string I can use to narrow things down? Or are we just looking at another Microsoft quirk…

sdetweil

@WallysWellies the ICS has
RRULE:FREQ=WEEKLY;UNTIL=20251007T164500Z;INTERVAL=1;BYDAY=TU;WKST=MO

so its a source problem. the parser processed this correctly.
we have no idea why its set like this, we just process the ICS data.

but the until is weird

Until Oct 08 (in the UI) , which isn’t a Tuesday, so the event could not happen then anyhow.
I’d try changing that and see what happens with the ICS data

WallysWellies

@sdetweil Thanks for the help. I’ll have a play around when I get a chance and see if I can figure out what’s going on.