DEADLINE doesn't actually limit recurring event display in org-agenda.
Instead, use org-agenda-skip-function-global to filter entries where
today's date is past the CALDAV_UNTIL property.
The skip function:
- Checks for CALDAV_UNTIL property (set by caldav sync advice)
- Parses YYYYMMDD format
- Skips entry if today > UNTIL date
This properly hides expired recurring events from the agenda.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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