Creating a Google Calendar API event requires a deliberate destination and explicit start and end data. A successful request can still describe the wrong meeting if its date or time-zone assumptions are incorrect. Build the event from a confirmed schedule rather than the server’s local clock conventions.
Choose the calendar and permission
Use events.insert with the intended calendarId. The special value primary refers to the authenticated user’s primary calendar. Check a currently accepted authorization scope and the user’s actual write permission for that destination before sending a mutation.
Represent the interval correctly
For timed events, use start.dateTime and end.dateTime in the documented RFC3339 format. The reference requires an offset unless a time zone is explicitly specified. Named time-zone fields use IANA names and are required for recurring-event expansion. Keep the end after the intended start.
All-day events use start.date and end.date instead. The event end is exclusive. Do not mix date-only and timed assumptions or copy a display string from a regional interface without interpreting it.
Verify before declaring completion
Inspect the returned event identifier, destination, and actual interval, then retrieve the saved record when needed. Review guest-update choices and conference generation separately. Do not blindly repeat an ambiguous insert response: a request may have succeeded before the response was lost. Google’s creation guide describes client-generated identifiers that meet its format rules as a duplicate-prevention aid. Keep a durable operation record and reconcile the specific intended event before retrying. The verified result is the correct saved event, not merely a successful transport response.
References
- Create events | Google Calendar | Google for Developers
- Events | Google Calendar | Google for Developers
- Events: insert | Google Calendar | Google for Developers
Reviewed against the linked official product guidance on November 4, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.