[GH-ISSUE #384] Allow synchronization of alarms to be reminded after event start #1269

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opened 2026-03-14 00:49:07 +03:00 by kerem · 1 comment

kerem commented

2026-03-14 00:49:07 +03:00

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Originally created by @ebfdhac on GitHub (Feb 19, 2023).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/384

I've been using outlookcaldavsynchronizer to sync my calendars for a while. The calendars are managed on a Synology DSM and maintained via the IOS calendar client, the Synology web interface and Outlook. This works very well so far.

However, I keep getting the warning message Alarm has an invalid duration or is not before event start. Ignoring. if I want to be reminded for an all-day appointment at 8:00 a.m. on the day of the event, for example.

Why are alarms not allowed during the appointment period? Can this be customized?

Originally created by @ebfdhac on GitHub (Feb 19, 2023). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/384 I've been using outlookcaldavsynchronizer to sync my calendars for a while. The calendars are managed on a Synology DSM and maintained via the IOS calendar client, the Synology web interface and Outlook. This works very well so far. However, I keep getting the warning message `Alarm has an invalid duration or is not before event start. Ignoring.` if I want to be reminded for an all-day appointment at 8:00 a.m. on the day of the event, for example. Why are alarms not allowed during the appointment period? Can this be customized?

kerem closed this issue

2026-03-14 00:49:13 +03:00

kerem commented

2026-03-14 00:49:18 +03:00

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@aluxnimm commented on GitHub (Mar 16, 2023):

It's an Outlook limitation, not on our side. So we have to ignore iCalendar alarms after the event start time.

@aluxnimm commented on GitHub (Mar 16, 2023): It's an Outlook limitation, not on our side. So we have to ignore iCalendar alarms after the event start time.