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Implemented calendar-sync.el as a complete replacement for org-gcal, featuring:
**Core Functionality:**
- One-way sync from Google Calendar to Org (via .ics URL)
- UTC to local timezone conversion for all event timestamps
- Chronological event sorting (past → present → future)
- Non-blocking sync using curl (works reliably in daemon mode)
**Automatic Timezone Detection:**
- Detects timezone changes when traveling between timezones
- Tracks timezone offset in seconds (-21600 for CST, -28800 for PST, etc.)
- Triggers automatic re-sync when timezone changes detected
- Shows informative messages: "Timezone change detected (UTC-6 → UTC-8)"
**State Persistence:**
- Saves sync state to ~/.emacs.d/data/calendar-sync-state.el
- Persists timezone and last sync time across Emacs sessions
- Enables detection even after closing Emacs before traveling
**User Features:**
- Interactive commands: calendar-sync-now, calendar-sync-start/stop
- Keybindings: C-; g s (sync), C-; g a (start auto-sync), C-; g x (stop)
- Optional auto-sync every 15 minutes (disabled by default)
- Clear status messages for all operations
**Code Quality:**
- Comprehensive test coverage: 51 ERT tests (100% passing)
- Refactored UTC conversion into separate function
- Clean separation of concerns (parsing, conversion, formatting, sorting)
- Well-documented with timezone behavior guide and changelog
**Migration:**
- Removed org-gcal-config.el (archived in modules/archived/)
- Updated init.el to use calendar-sync
- Moved gcal.org to .emacs.d/data/ for machine-independent syncing
- Removed org-gcal appointment capture template
Files modified: modules/calendar-sync.el:442, tests/test-calendar-sync.el:577
Files created: data/calendar-sync-state.el, tests/testutil-calendar-sync.el
Documentation: docs/calendar-sync-timezones.md, docs/calendar-sync-changelog.md
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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