[caldeveloper-l] EXDATE value not same type as DTSTART

[Michael Douglass]

On 9/30/20 13:49, Ken Murchison wrote:
> All,
>
> Should/must the value type of EXDATE match that of DTSTART?  My 
> assumption is that it MUST due to the fact that a EXDATE would be a 
> specific occurrence based on the RRULE.  But, RFC 5545 appears to be 
> silent on the issue.  The reason I ask is that we have a user whose 
> client generates something like the following:
>
> DTSTART;TZID=America/Los_Angeles:20130930T073000
> DTEND;TZID=America/Los_Angeles:20130930T073500
> RRULE:FREQ=WEEKLY;INTERVAL=1;UNTIL=20140225;BYDAY=MO,TU,WE,TH,FR
> EXDATE;VALUE=DATE:20131128
> EXDATE;VALUE=DATE:20131129
> EXDATE;VALUE=DATE:20131220
> EXDATE;VALUE=DATE:20131223
> EXDATE;VALUE=DATE:20131224
> EXDATE;VALUE=DATE:20131225
> EXDATE;VALUE=DATE:20131226
> EXDATE;VALUE=DATE:20131227
> EXDATE;VALUE=DATE:20140101
>
>
> Is this valid iCalendar?  Should processing software exclude all 
> instances of a recurring event that occur on the given dates, 
> regardless of the time of day (e.g. an event that occurs multiple 
> times per day)?

I'd asked something the same earlier - are EXDATE and RDATE required to 
be the same form as DTSTART - and if DTSTART has a TZID is it required 
to be the same for all?

5545 doesn't say but that could be an omission.

Also what about

RDATE;VALUE=PERIOD:19960403T020000Z/19960403T040000Z,
  19960404T010000Z/PT3H

This doesn't allow for specifying DATE or DATE-TIME