bug#69894: 29.1; Icalendar export conflict with calendar iso date

[RwN]

Dear All,

In a diary file, with a simple entry entry "2024-03-19 10:00 Appointment", 
icalendar-export-file process to an error: "Could not parse date". The entry is 
provided by the default value of calendar-iso-date-display-form.

I solve the problem with the following patch mathchin '-' has a separator in 
the function icalendar--datestring-to-isodate :

diff -u --label /usr/local/share/emacs/29.1/lisp/calendar/icalendar.el.gz 
--label /tmp/icalendar.el /tmp/jka-commHr8dl /tmp/icalendar.el
--- /usr/local/share/emacs/29.1/lisp/calendar/icalendar.el.gz
+++ /tmp/icalendar.el
@@ -894,8 +894,8 @@
     (save-match-data
       (cond ( ;; iso-style numeric date
              (string-match (concat "\\s-*"
-                                   "\\([0-9]\\{4\\}\\)[ \t/]\\s-*"
-                                   "0?\\([1-9][0-9]?\\)[ \t/]\\s-*"
+                                   "\\([0-9]\\{4\\}\\)[ \t/-]\\s-*"
+                                   "0?\\([1-9][0-9]?\\)[ \t/-]\\s-*"
                                    "0?\\([1-9][0-9]?\\)")
                            datestring)
              (setq year (read (substring datestring (match-beginning 1)

Diff finished.  Tue Mar 19 02:40:06 2024

Is it a correct solution to proposed? 
RwN.



In GNU Emacs 29.1 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo 
version 1.16.0) of 2023-10-16 built on laptop
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
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