two way calendar sync scheduling

If you mean two-way calendar sync for scheduling, it usually means:

• Changes in Calendar A appear in Calendar B
• Changes in Calendar B also appear in Calendar A
• Usually includes:
  • creating events
  • updating events
  • deleting events
  • syncing availability/free-busy

Common use cases

• Google Calendar ↔ Outlook Calendar
• Personal calendar ↔ team scheduling tool
• CRM meeting booking ↔ employee calendar
• Customer appointments ↔ internal staff schedules

Important considerations

• Conflict handling: what happens if the same event is edited in both places?
• Source of truth: one calendar may need to “win” for certain fields.
• Recurrence rules: repeating events can be tricky to sync correctly.
• Permissions/privacy: some systems sync only busy blocks, not full details.
• Latency: near real-time vs periodic sync.
• Deletion behavior: deleting in one calendar should usually remove or cancel in the other.

Typical architecture

1. Initial sync of existing events
2. Webhooks / change notifications when events change
3. Mapping table to store event IDs between systems
4. Sync engine to apply create/update/delete in both directions
5. Deduplication and conflict resolution logic

Best practices

• Maintain a unique external ID for each linked event
• Store last_synced_at and sync_version
• Use idempotent updates
• Prevent infinite loops by marking sync-originated changes
• Define rules for overlapping edits and time-zone changes

If you want, I can help with any of these:

1. a system design for two-way calendar sync
2. API logic for Google/Outlook sync
3. a database schema for syncing events
4. conflict resolution rules for scheduling