GNU bug report logs - #78085
30.1; wrong iCalendar export with diary-float

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Timo E." <tengel <at> mailbox.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.1; wrong iCalendar export with diary-float
Date: Sun, 27 Apr 2025 11:05:20 +0200

Hi,

the iCalendar export seems wrong when the .org file contains events 
with diary-float.
I reported this already to emacs-orgmode <at> gnu.org, but it is not an 
issue in Org mode but in 'icalendar--convert-float-to-ical'.

For example, my .org file contains:
* my appointment
%%(diary-float t 6 1) 1st Sat/month

The agenda M-x org-agenda-list shows this event correctly at the first 
Saturday per month.
The .ics file created with M-x org-export-dispatch, c (Export to 
iCalendar), f (Current file) contains the event

BEGIN:VEVENT
UID:DS1-ddf9e720-3c8a-4b2a-93d8-62dde9cdf5a8
DTSTART;VALUE=DATE:20250418
EXDATE;VALUE=DATE:20250418
RRULE:FREQ=MONTHLY;BYDAY=1SA
SUMMARY:1st Sat/month
END:VEVENT

DSTART and EXDATE are set to the current date. (i.e. the date when the 
.ics file is created). I think DSTART should be set to the next first 
Saturday of the month. EXDATE is not required, as there are no 
exceptions specified.

RFC 5545 says in 3.8.5.3. Recurrence Rule
"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."

Thanks
Timo

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