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A server-provided identifier for this calendar item.

Component Version macOS Windows Server FileMaker Cloud FileMaker iOS SDK
Events 6.2 Yes No Yes, macOS only No No

MBS( "Events.Item.CalendarItemExternalIdentifier"; EKCalendarItem )


Parameter Description Example value
EKCalendarItem The reference to the calendar item: an event or reminder. $item


Returns ID or error.


A server-provided identifier for this calendar item.
This identifier, provided by the server, allows you to reference the same event or reminder across multiple devices. For calendars stored locally on the device, including the birthday calendar, it simply passes through to calendarItemIdentifier.
This identifier is unique as of creation for every calendar item. However, there are some cases where duplicate copies of a calendar item can exist in the same database, including:

This identifier is the same for all occurrences of a recurring event. If you wish to differentiate between occurrences, you may want to use the start date.
In addition, there are two caveats for Exchange-based calendars:

See also

Example Databases

Events.Item.Attendees   -   Events.Item.CalendarItemIdentifier

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