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glibc 2.28 in RHEL 8 has a bug that causes 24 hour time to be used in the US.

Instead of using the correct date format RHEL 8 is using the default, which is 24h time:

   "%a %b %e %H:%M:%S %Z %Y"

It should be:

   "%a %b %e %r %Z %Y""


So instead of displaying:

   Wed Sep  1 21:44:02 CDT 2021

It should display:

   Wed Sep  1 09:44:02 PM CDT 2021


This was already fixed in upstream glibc with the following BZs and patches:

   en_US locale doesn't define date_fmt
   https://sourceware.org/bugzilla/show_bug.cgi?id=24046

   Regression: en_US date_fmt and d_t_fmt and "%a %d %b" vs. "%a %b %e"
   https://sourceware.org/bugzilla/show_bug.cgi?id=25923

These patches appear to fix the issue for en_US:

   https://github.com/bminor/glibc/commit/7395f3a0efad9fc51bb54fa383ef6524702e0c49
   https://github.com/bminor/glibc/commit/8cde977077b3568310c743b21a905ca9ab286724

We do not make such changes to widely used locales after the release of the product because it would rather surprising. For example, it could affect the format of log files, so that automation no longer can parse them after the change.

I suspect the customer is looking for an option to change the desktop clock to 24 hour format. I expect there are different ways to achieve this that do not involve changing the definition of the en_US.utf8 locale.

We should add at least one 12-hour locale that can be combined with English-language locales, by setting LC_TIME. No such locale exists right now.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (glibc bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2005