Binary package hint: xorg
(This bug report arises from Ubuntu Question 75465 :
https://answers.launchpad.net/ubuntu/+source/xclock/+question/75465 )
This bug dates to at least 2006. Basically, running "xclock -digital" should give you a small window with a digital clock. Adding the option "-twentyfour" is supposed to force the clock to display the time in 24-hour format. Similarly, the option "-twelve" is supposed to force the clock to display the time in 12-hour format.
What actually happens is that xclock's digital output will be the same regardless of the -twelve or -twentyfour flag passed. For me and the original poster of Question 75465, the time is always displayed in twelve-hour format. There is an ancient debian bug about the same problem: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=352967
I'm experiencing this issue on Intrepid. I am using version 1:7.4~5ubuntu3 of the 'xorg' package. Running Xorg -version says:
X.Org X Server 1.5.2
Release Date: 10 October 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-19-server i686 Ubuntu
Current Operating System: Linux jk-d420 2.6.27-14-generic #1 SMP Wed Apr 15 18:59:16 UTC 2009 i686
Build Date: 09 March 2009 10:48:54AM
xorg-server 2:1.5.2-2ubuntu3.1 (<email address hidden>)
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Module Loader present
Thanks for including the related Debian bug.