OptionalaccountThe account under which the calendar is registered. Required on Android. Typically an email address.
OptionalcolorNamed color (blue, …) or hex #RRGGBB / #RRGGBBAA.
When omitted, Android and iOS use #007AFF.
On Android, only hex is accepted; named colors reject with Invalid color format.
OptionalownerThe owner of the calendar. Required on Android. Typically an email address.
OptionalsourceThe EventKit source (account) where the calendar should be created.
If provided, it must match an existing source from fetchAllCalendarSources().
If omitted, iCloud is used when available, otherwise the local source.
Since
5.2.0