Google Calendar — Update event

Google Calendar — Update event

Type: googlecalendar-update-event  ·  Package: Google Calendar v1.0.5  ·  Output: Dictionary<string,object>

Changes an existing event. Only the fields you set change; the rest (guests, Meet link, reminders…) is kept. Useful to reschedule, change the room or update the description.

How it works

Sends Google only the fields that have a value:

• An empty field is kept: this activity cannot clear the location or description, only replace them.
• Dates follow the same rules as in Create event: a DateTime or ISO 8601 text; without an offset they are read in timeZone or the calendar’s zone, and with allDay only the date (exclusive end). Since version 1.0.5.
• If you change start, set end too: if the new start falls after the event’s current end, Google rejects the change. To turn a timed event into an all-day one (or the other way round), give both with a matching allDay.
• Guests are untouched; to add guests use Add attendee.

Required parameters

Parameter	Type	Default	Description
eventId	string	—	ID of the event to update.

Optional parameters

Parameter	Type	Default	Description
session	ZoanGoogleCalendarSession	—	Session from Google Calendar — Connect. Inside Connect’s body it is inherited and you can leave it empty.
calendarId	string	primary	Calendar ID (from Get calendars). primary is the account’s main calendar.
summary	string	—	New title (empty = keep).
start	DateTime | string	—	New start: a DateTime or ISO 8601 text. Set end too.
end	DateTime | string	—	New end, in the same format.
allDay	bool	false	Treat the new start/end as all-day.
timeZone	string	—	IANA time zone for the new start/end without an offset. If empty, the calendar’s.
location	string	—	New location (empty = keep).
description	string	—	New description (empty = keep).
notify	bool	false	Email the guests about the change.

Output

Returns a Dictionary with the updated event data (same keys as Create event).

Common errors

Message	Cause and fix
'eventId' is required.	eventId is empty or its expression returned null.
Invalid date/time '…'. Use ISO 8601 (e.g. 2026-06-15T14:30:00) or a DateTime value.	start or end is neither a DateTime nor ISO 8601 text (for example, 15/06/2026). Pass the DateTime directly or the text as yyyy-MM-ddTHH:mm:ss.
Unknown time zone '…'. Use an IANA time zone such as America/Bogota.	timeZone is not a valid IANA zone.
The date has no time zone and the calendar's time zone could not be determined. …	The date has no offset, timeZone is empty and the account could not read the calendar’s zone. Set timeZone or include the offset in the date.
No Google Calendar session available. Provide 'session' from a googlecalendar-connect activity, or place this activity inside the Connect activity's body …	The activity is outside Connect’s body and received no session. Move it inside the body or pass the saved session.
The service calendar has thrown an exception. HttpStatusCode is BadRequest…	The new range is empty (end not after start).
The service calendar has thrown an exception. HttpStatusCode is …	Google rejected the call: unknown calendar or event, no access, expired token or quota exceeded. See Google API errors.

Example

Reschedule a meeting and let the guests know:

Google Calendar — Connect   credential = credential("calendar-team")
 └─ body:
      Google Calendar — Update event   eventId = meetingId
                                        start = "2026-06-16T10:00:00-05:00"   end = "2026-06-16T11:00:00-05:00"
                                        notify = true   → output: updated
      Log   message = "New start: " + updated["start"]

Related activities

• Google Calendar — Create event — create an event.
• Google Calendar — Get event by ID — read the event before changing it.
• Google Calendar — Delete event — cancel the event.
• All Google Calendar activities