[PATCH] tests: date: add another locale test case

[Collin Funk]

On a GNU/Linux system, we have the following:

    $ LC_ALL=en_US.UTF-8 date -u -d 1:00
    Sun Dec 14 01:00:00 AM UTC 2025
    $ LC_ALL=en_US.UTF-8 locale date_fmt
    %a %b %e %r %Z %Y
    $ LC_ALL=en_US.UTF-8 locale t_fmt_ampm
    %I:%M:%S %p

    $ LC_ALL=nl_NL.UTF-8 date -u -d 1:00
    zo 14 dec 2025  1:00:00 UTC
    $ LC_ALL=nl_NL.UTF-8 locale date_fmt
    %a %e %b %Y %k:%M:%S %Z

We respect the locales preference for a leading zero or leading space in
single digit hours.

* tests/date/date-locale-hour.sh: Check that the locales preference for
leading zeros or spaces in single digit hours is used.
---
 tests/date/date-locale-hour.sh | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tests/date/date-locale-hour.sh b/tests/date/date-locale-hour.sh
index 7e0d12019..1f44bc3eb 100755
--- a/tests/date/date-locale-hour.sh
+++ b/tests/date/date-locale-hour.sh
@@ -34,6 +34,23 @@ for loc in "$LOCALE_FR_UTF8" 'en_US.UTF-8'; do
     *"$compare_time"*) ;;
     *) fail=1 ;;
   esac
+
+  # The use of %r requires checking 'locale t_fmt_ampm' for the format.
+  fmt=$(LC_ALL="$loc" locale date_fmt)
+  case "$fmt" in
+    *%r*) fmt=$(LC_ALL="$loc" locale t_fmt_ampm) ;;
+  esac
+
+  case "$fmt" in
+    *%[IHRT]*)  compare_time='01:00' ;;
+    *%[lk]*)    compare_time=' 1:00' ;;
+    *) skip_ 'unrecognised locale hour format';;
+  esac
+
+  case $(LC_ALL="$loc" date -d '2025-10-11T01:00') in
+    *"$compare_time"*) ;;
+    *) fail=1 ;;
+  esac
 done
 
 
-- 
2.52.0