Root cause: Both frontend and backend were adding a day for all-day events:
- Frontend: Converts inclusive UI dates (9/22-9/25) to exclusive (9/22-9/26)
- Backend: Was incorrectly adding another day (9/22-9/27) causing display issues
Fixed by:
- Remove duplicate day addition in backend handlers (events.rs, series.rs)
- Keep frontend conversion for proper RFC 5545 compliance
- Add reverse conversion when loading events for editing
- Maintain user-friendly inclusive dates in UI while storing exclusive dates
Now properly handles: UI 9/22-9/25 ↔ Storage 9/22-9/26 (exclusive per spec)
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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