add_timezone

Description:

public async bool add_timezone (Timezone zone, Cancellable? cancellable) throws Error

Add a VTIMEZONE object to the given calendar client.

The call is finished by add_timezone.end from the callback.

this	an Client
zone	The timezone to add
cancellable	a Cancellable; can be null
callback	callback to call when a result is ready
user_data	user data for the `callback`