#1004117 thunderbird: time format is 24 hour with system locale set to en_US.UTF-8

Package:
thunderbird
Source:
thunderbird
Description:
mail/news client with RSS, chat and integrated spam filter support
Submitter:
Ryan Nowakowski
Date:
2025-05-15 06:45:01 UTC
Severity:
normal
#1004117#5
Date:
2022-01-21 03:52:43 UTC
From:
To:
Dear Maintainer,

After upgrading to bullseye, I noticed that the time format changed from
am/pm to 24 hr even though my locale is still set to en_US.UTF-8
#1004117#10
Date:
2025-05-15 06:40:27 UTC
From:
To:
Dear maintainers,

I have a similar issue with localization, but vice-versa:

I am running Thunderbird version 128.10.0esr (64-bit) on Debian 13, Linux Kernel 6.12.27-amd64 running under the Xfce 4.20 desktop environment, all packages installed from the main Debian package repository.

My environment variables are set to English language, but German regional settings:

Now, my calendar (or e-mail reply header etc.) displays times in en_US-notation (with AM/PM), though. Please see attached for a screenshot of the events pane containing several events, all with AM/PM times.

Thunderbird claims to honor the system settings/environment variables (and did, in the past). I am pretty sure that they are set correctly, since virtually all of my other applications behave as expected.

Additional information:
Attached, you can find a screenshot of TB's troubleshooting information (localization section).
Console / terminal date on the same system, same user logged in, TB running in parallel:

If there is anything that I should try or report to help fix this, please let me know.

Regards,
Ferdinand Rau