[Ietf-calsify] Section 4.8.5.3 Recurrence Date/Times: RDATE < DTSTART

[Reinhold Kainhofer]

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Am Sonntag, 5. November 2006 23:33 schrieb Bernard Desruisseaux:
> In section 4.8.5.3 Recurrence Date/Times of RFC 2445 it says:
>  > The "DTSTART" property defines the first instance in the
>  > recurrence set.
>
> I believe this section should clarify that the "RDATE" property
> value can actually be earlier in time than the value of the
> "DTSTART" property.

I always understood this sentence that the DTSTART is always the first 
date/time of the event and RDATE cannot be earlier. Otherwise, to determine 
whether an event happens today, one would have to look at all recurrences of 
all events, future or past. If the DTSTART is always the first time, then it 
suffices to look at all events that have already started at the given date 
(i.e. DTSTART<=givenDateTime).

Cheers,
Reinhold
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Reinhold Kainhofer, Vienna University of Technology, Austria
email: reinhold at kainhofer.com, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
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