Calendar events incorrectly appear in another month

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Calendar events incorrectly appear in another month

Phillip Kolbe 0

Help me understand why a March 13th event is appearing in April. The .ics file datestamp indicates March 13th. Can this be corrected via the user interface, or do I need to re-code the .ics file?

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Answer 1

Hi Phillip Kolbe,

Welcome to Microsoft Q&A forum.

For cases where an event that should be on March 13 appears in April when using an.ics file, the cause is usually related to the date/recurrence details inside the .ics file, or how the calendar was added (importing a file vs. subscribing to a link).

You can troubleshoot this quickly using one of the options below:

1. If you uploaded/imported the .ics file (one-time import):

Open the event and check/adjust the Date, and (if it’s a repeating anniversary/recurring event) the Repeat/Recurrence settings to ensure it repeats on March 13 each year.
If the item is editable in the interface, you may not need to edit the .ics file.

2. If you subscribed from the web (added the calendar using an ICS/iCal link):

With a subscription, the calendar is driven by the source feed (and updates can be delayed), so the long-term fix is usually to correct the .ics data at the source.
You may then need to remove and re-subscribe if required.

Important note: The “datestamp” you see in an .ics file is not always the field that determines where the event lands on the calendar view. To verify what Outlook is using, you typically need to check the event’s actual start/end date and any recurrence rules within the .ics content.

Please feel free to let me know if you have any further updates, thanks.

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Phillip Kolbe 0 Reputation points

2026-04-02T01:42:33.6666667+00:00

The event, along with another repeating event on the same date, appeared in their correct month, March (last month), and now they appear in April (current month). Both were created in the desktop app for Mac. I have seen this behavior before, but this incident is my first inquiry about it. Although the ICS file appears to contain more lines than necessary, I cannot find any reference to April in the ICS file code. Thank you for proactively hiding personal identifiable information. I will privately upload the ICS file referenced in this discussion separately.
Chloe-V 7,255 Reputation points Microsoft External Staff Moderator

2026-04-02T07:28:53.47+00:00

Hi Phillip Kolbe,

Thank you for the update. After reviewing the file, the event is defined as a yearly recurrence on March 13. The file shows RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTHDAY=13;BYMONTH=3 and DTSTART:20220313T150000Z, which both point to March, not April. I also do not see any April date in the recurrence entries included in the file. Based on the file content alone, the calendar data itself does not appear to be coded for April. So based on the file content alone, this does not look like something that needs the .ics recurrence month re-coded. The event data in the file is already set to March 13. That suggests the issue is more likely with how Outlook for Mac is interpreting or displaying this recurring item, rather than with the month stored in the calendar data itself.

I would suggest removing the incorrect recurring item and recreate it directly in Outlook for Mac, or delete it and then import a fresh copy again.

Thank you for your time and understanding.

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