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Re: [calsify] [Technical Errata Reported] RFC5545 (5920)

Doug Royer <douglasroyer@gmail.com> Tue, 26 November 2019 21:40 UTC

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From: Doug Royer <douglasroyer@gmail.com>
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Subject: Re: [calsify] [Technical Errata Reported] RFC5545 (5920)
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On 11/26/19 1:50 PM, RFC Errata System [Masked] wrote:

> Original Text
> -------------
> Every Friday the 13th, forever:
>
>         DTSTART;TZID=America/New_York:19970902T090000
>         EXDATE;TZID=America/New_York:19970902T090000
>         RRULE:FREQ=MONTHLY;BYDAY=FR;BYMONTHDAY=13
>
>         ==> (1998 9:00 AM EST) February 13;March 13;November 13
>             (1999 9:00 AM EDT) August 13
>             (2000 9:00 AM EDT) October 13
>             ...
>
> Corrected Text
> --------------
> Every Friday the 13th, forever:
>
>         DTSTART;TZID=America/New_York:19980213T090000
>         RRULE:FREQ=MONTHLY;BYDAY=FR;BYMONTHDAY=13
>
>         ==> (1998 9:00 AM EST) February 13;March 13;November 13
>             (1999 9:00 AM EDT) August 13
>             (2000 9:00 AM EDT) October 13
>             ...
>
> Notes
> -----
> The "DTSTART" property is not synchronized with the recurrence rule.
>
> Although it may be removed from the recurrence set by an "EXDATE" property, the description at the start of section 3.8.5.3 leaves no doubt that the "DTSTART" property should still be synchronized with the recurrence rule.

Did (do?) some implementations not do this? Why is it a "SHOULD" and not a "MUST"?

And 2445 said the same (and had the same example error):

   2445: The "DTSTART" property defines the first instance in the recurrence set.

5545 Current text (in 3.8.5.3):

The "DTSTART" property value SHOULD be synchronized with the recurrence rule, if specified.
The recurrence set generated with a "DTSTART" property value not synchronized with the recurrence rule is undefined.

Change To?

The "DTSTART" property value MUST be synchronized with first instance of the recurrence rule, if specified

And update Appendix A: "A.1".


-- 
Doug Royer - (http://DougRoyer.US)
Douglas.Royer@gmail.com
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