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Re: [calsify] JSCalendar: alternative to current all-day events

Doug Royer <douglasroyer@gmail.com> Wed, 19 June 2019 05:04 UTC

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From: Doug Royer <douglasroyer@gmail.com>
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Subject: Re: [calsify] JSCalendar: alternative to current all-day events
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On 6/18/19 7:20 PM, Bron Gondwana wrote:
> On Wed, Jun 19, 2019, at 07:13, Doug Royer wrote:
>> TZ is not required, and *is* allowed on Date-Time and Date events.
>>
>> DTSTART;TZID=America/New_York;VALUE-DATE:19980119
> 
> Do you have a citation to support this statement?
> 
> Mike and I are basing our understanding from reading RFC 5545: Section 
> 3.2.19
> 
>        The "TZID" property parameter MUST NOT be applied to DATE
>        properties and DATE-TIME or TIME properties whose time values are
>        specified in UTC.
> 

That is because UTC (Z) is a time zone. It has nothing to do with all 
day or anniversary. A 'Z' in addition to a TZID would be placing two 
time zones into the same property. That would be nonsensical.


> It does is somewhat fuzzy langauge, but our impression at CalConnect the 
> other week when we look at this was that RFC5545 prohibits the use of 
> TZID with VALUE=DATE.

The ABNF does not exclude TZID with VALUE=DATE. I can not find anything 
that does. It is not excluded in DTSTART, DUE, DTEND, RECURRENCE-ID, 
EXDATE, or RDATE. All of their ABNF allows for it.


-- 

Doug Royer - (http://DougRoyer.US)
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