Subject: 29.1; Icalendar export conflict with calendar iso date

From: RwN <[email-masked]>
Date: Tue, 19 Mar 2024 02:56:57 +0100

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.

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