> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.googlecalendar/calendar-operations.md).

# Calendar operations

Use this operation to check availability in a calendar in Google Calendar. Refer to [Google Calendar](/integrations/builtin/app-nodes/n8n-nodes-base.googlecalendar.md) for more information on the Google Calendar node itself.

## Availability <a href="#availability" id="availability"></a>

Use this operation to check if a time-slot is available in a calendar.

Enter these parameters:

* **Credential to connect with**: Create or select an existing [Google Calendar credentials](/integrations/builtin/credentials/google.md).
* **Resource**: Select **Calendar**.
* **Operation**: Select **Availability**.
* **Calendar**: Choose a calendar you want to check against. Select **From list** to choose the title from the dropdown list or **By ID** to enter a calendar ID.
* **Start Time**: The start time for the time-slot you want to check. By default, uses an expression evaluating to the current time (`{{ $now }}`).
* **End Time**: The end time for the time-slot you want to check. By default, uses an expression evaluating to an hour from now (`{{ $now.plus(1, 'hour') }}`).

### Options <a href="#options" id="options"></a>

* **Output Format**: Select the format for the availability information:
  * **Availability**: Returns if there are already events overlapping with the given time slot or not.
  * **Booked Slots**: Returns the booked slots.
  * **RAW**: Returns the RAW data from the API.
* **Timezone**: The timezone used in the response. By default, uses the n8n timezone.

Refer to the [Freebusy: query | Google Calendar](https://developers.google.com/calendar/api/v3/reference/freebusy/query) API documentation for more information.