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I have iOS application(written on objective c) which works with events from the calendar. Something strange that I saw is on change of recurrent meeting is that in the most of the cases the calendarItemExternalIdentifier field was changed and there is /RID=XXXXXXX part is added but in some of the cases I receive same calendarItemExternalIdentifier with 20161205 added at the end.

For example I have external identifiers like this:

oiok2qp12o6k3d2ru34v885njo@google.com

And on change I can receive this:

oiok2qp12o6k3d2ru34v885njo@google.com/RID=505299600

or this:

oiok2qp12o6k3d2ru34v885njo@google.com<!ExceptionDate!>20161205

Why we have this and what is the difference?

m1sh0
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1 Answers1

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As far as I figured out (while on search for an answer for this, too)< the difference relies on which calendar type you are using.

Exchange Calendar events use /RID=, where the Timestamp is the time interval since 00:00:00 UTC on 1 January 2001 to the new Date.

while

Local Calendar (and I think CalDAV Calendars - I'll check this later) use

emmics
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  • Yes the difference is in the type of the calendars, thanks for your answer – m1sh0 Jun 20 '17 at 11:30
  • Thanks for accepting! Have you figured out something about other calendar types yet? – emmics Jun 20 '17 at 11:37
  • No, just start using mostly the first part of the external id where in the example is oiok2qp12o6k3d2ru34v885njo@google.com. – m1sh0 Jun 20 '17 at 11:54