bug#53702: 27.1; diary does not display some entries in european style

[Michael Heerdegen]

Hello again,

sorry for the duplicated last message - my first message had bounced,
but apparently only from the poster's address.

Ok - small addition: the dot should be added in the subsequent line as
well:

From 5346b90b9884b9190cfe77310f2444ed35d182eb Mon Sep 17 00:00:00 2001
From: Michael Heerdegen <michael_heerdegen@web.de>
Date: Wed, 2 Feb 2022 01:08:43 +0100
Subject: [PATCH] WIP: Try to fix #53702

---
 lisp/calendar/calendar.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/calendar/calendar.el b/lisp/calendar/calendar.el
index 48d308afad..0605e4bf51 100644
--- a/lisp/calendar/calendar.el
+++ b/lisp/calendar/calendar.el
@@ -800,8 +800,8 @@ diary-american-date-forms
 (defcustom diary-european-date-forms
   '((day "/" month "[^/0-9]")
     (day "/" month "/" year "[^0-9]")
-    (backup day " *" monthname "\\W+\\<\\([^*0-9]\\|\\([0-9]+[:aApP]\\)\\)")
-    (day " *" monthname " *" year "[^0-9:aApP]")
+    (backup day " *" monthname "\\W+\\<\\([^*0-9]\\|\\([0-9]+[:.aApP]\\)\\)")
+    (day " *" monthname " *" year "[^0-9:.aApP]")
     (dayname "\\W"))
   "List of pseudo-patterns describing the European style of dates.
 The defaults are: DAY/MONTH; DAY/MONTH/YEAR; DAY MONTHNAME;
--
2.30.2


I'm now a bit worried about this paragraph in
(info "(emacs) Appointments"):

|    You can write times in am/pm style (with ‘12:00am’ standing for
| midnight and ‘12:00pm’ standing for noon), or 24-hour European/military
| style.  You need not be consistent; your diary file can have a mixture
| of the two styles.  Times must be at the beginning of diary entries if
| they are to be recognized.

Military style is 1200 for 12:00am, right?  This definitely can't be
used everywhere when using the European style because lines get
ambiguous: for digits could mean a year - or a military time in a line
not specifying a year.  Should that paragraph be corrected?

Michael.