GNU bug report logs - #74994
Improve Emacs iCalendar support

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Message #71 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Richard Lawrence <rwl <at> recursewithless.net>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] Updated patch for Bug#74994: add support for recurrence rules
Date: Wed, 12 Mar 2025 11:02:28 +0100

[Message part 1 (text/plain, inline)]

Tags: patch

I've been steadily working on this and I've reached another milestone
this week: I now have a working implementation of recurrence rules,
including time zone support. This is the big, complicated part of
iCalendar semantics that none of the existing code completely supports;
but it's essential, because most date-times in iCalendar are defined as
local times with a reference to a time zone, and calculating an actual
UTC offset requires applying the recurrence rules for that time zone.
Updated patch attached; the main addition here is icalendar-recur.el,
plus supporting functions in icalendar-macs.el and icalendar-utils.el.

It was a *lot* more work to get this working than I expected (mostly
because time zones are complicated...who knew? ;), but I can at least
say now that all the examples in RFC5545 work; see the tests in
icalendar-recur-tests.el.

[0001-Updated-patch-for-Bug-74994-add-support-for-recurren.patch (text/patch, attachment)]

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