pimutils / pimutils/vdirsyncer

This recurrence rule does not generate any valid instances

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type: 3rd party
Dominant language
Python
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Description

I have an event created with Apple Calendar on a CalDAV server with this RRULE:
RRULE:FREQ=YEARLY;UNTIL=20230430;BYMONTH=4;BYDAY=SU,SA;BYSETPOS=-1

When syncing this to another CalDAV server, I get this error message:
`<s:message>This recurrence rule does not generate any valid instances</s:message>

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Research direction

Start by tracing how vdirsyncer processes the reported RRULE during calendar synchronization; the issue does not name a file, test, or entry point. Reproduce the sync with the supplied rule and compare the generated instances with the server response. Done means the rule is handled correctly or the invalid-rule behavior is clearly documented and covered by a regression test.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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