Problem syncing All Day event series with Thunderbird

[EchoWaffles2]

Checklist

• [x] I can reproduce the bug with the latest version given here.
• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [x] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [x] This issue contains only one bug.
• [x] I have read and understood the contribution guidelines.

Affected app version

1.2.0

Affected Android/Custom ROM version

Android 14

Affected device model

Moto G Stylus 2024

How did you install the app?

F-Droid / IzzyOnDroid

Which calendar service or provider do you use, if any?

Posteo

Which sync adapter app do you use for calendar synchronization, if any?

DavX5

Steps to reproduce the bug

1. Have a shared calendar on both Fossify and Desktop Thunderbird (Debian Linux version ESR 128)
2. In Thunderbird: create an all day event that repeats daily M-F for 5 days
3. In Fossify confirm you see the 5 day series
4. In Fossify, delete the Thursday occurrence (select "delete the selected occurrence only")
5. In Thunderbird, confirm only the Thursday occurrence is deleted
6. In Fossify, both Thursday's AND Wednesday's occurrences are removed

Expected behavior

Deleting one event in a recurring series should only delete one event.

Actual behavior

Deleting one all day event in a repeating daily series deletes both that event AND the previous day's event (at least it deletes it from view in Fossify, the CalDAV data must still reflect it since Thunderbird and other apps synced to the server show it correctly)

Screenshots/Screen recordings

No response

Additional information

No response

[EchoWaffles2]

I believe this is related to the DTSTART and DTEND fields. In Thunderbird for All Day Events these are YYYYMMDD, but in Fossify there are additional characters, for example "T200000Z" (presumably the time or timezone)

[naveensingh]

In Fossify, delete the Thursday occurrence (select "delete the selected occurrence only")

What happens when you delete this event in Thunderbird? Is the previous occurrence still "deleted" in Fossify?

This is probably related to https://github.com/FossifyOrg/Calendar/issues/138 and/or https://github.com/FossifyOrg/Calendar/issues/468

[fossifybot-legacy]

This issue has been automatically closed due to inactivity. We requested additional information but have not received a response from the original author. Without the requested details, we cannot proceed. If you have or find the information needed, please comment so we can reopen the issue.

[naveensingh]

Please check if you still have this problem in the latest version.