Why do some Google Calendar events show as deleted then created, instead of updated?

Quick Answer

Google Calendar may treat major changes to an event (like big edits to recurring rules, organizer details, or data from external apps) as a new event rather than an update. This can cause your old event to appear as deleted and a new event to appear with a different ID.

Key Points

• Not a Bug
  Google Calendar’s system sometimes views a change as “too large” and replaces the entire event.

• Some Common Triggers

  • Major recurrence changes (e.g., from weekly to monthly).

  • Moving the event to a different calendar.

  • Organizer or ownership changes.

  • Edits from external sync tools (Outlook, Apple Calendar, etc.).

• Effects

  • You might see a delete-then-create sequence instead of a simple update.

  • Old event IDs no longer match new events.

  • Confusing dates between raw and created_at / updated_at

  • Your data may look like it has been “removed and re-added.”

• What To Do

  • Don’t worry—the content of your event is still intact, just under a new ID.

  • Keep track of event details (like title or time) rather than relying on ID alone.

  • Know it’s normal if you use recurring events or sync across multiple apps.

Bottom Line
These delete-and-create occurrences are normal for Google Calendar when it sees significant changes. It doesn’t mean anything is broken—just that Google is treating the event as new.