[Ietf-calsify] DTEND for day events

[Olivier Gutknecht]

Hi Jeffrey,

On Sep 1, 2005, at 8:20 PM, Jeffrey Harris wrote:
>> rfc2445 is unclear if the DTEND is inclusive or exclusive when  
>> both the
>> DTSTART and DTEND are DATEs.
>>
>
> To find the language about this, you have to look in the (not
> intuitively located) VEVENT definition.  It says:
>
> The "DTSTART" property for a "VEVENT" specifies the inclusive start
>    of the event. For recurring events, it also specifies the very  
> first
>    instance in the recurrence set. The "DTEND" property for a "VEVENT"
>    calendar component specifies the non-inclusive end of the event.
>
> It doesn't say anything specific about DATE valued events, so DTEND is
> always exclusive.

Which also makes sense with the DATETIME case (i.e. a 'ponctual' event):
"For cases where a "VEVENT" calendar component
    specifies a "DTSTART" property with a DATE-TIME data type but no
    "DTEND" property, the event ends on the same calendar date and time
    of day specified by the "DTSTART" property.

> In practice, Apple's iCal always exports one-day all-day events  
> with an
> explicit DTEND of the day after the start.  I scratched my head about
> that for a while, too, till I looked in VEVENT.

I'm not sure it's 'always'. I think that with our implementation you  
might get in
some cases a  one-day DATE valued event without a DTEND.

Ol.