Ask Different is a question and answer site for power users of Apple hardware and software. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I just got a MacBook Pro, and different from my iMac is that I'll be using the lock-screen much more on this one.

I noticed that in the upper right corner of the lock screen, the time is shown, but it is in 12-hour mode with AM/PM indicators.

I guess this is some remnant of the machine having been configured to use english language as the main language (I'm a developer, I don't want to have to fight with badly worded Norwegian translations of error messages on google).

I have configured my main user to have normal Norwegian formats for everything, but I guess that on the lock (and possibly on the logon screen as well?) screen, there is some kind of global system-wide configuration in use.

So, can I:

  1. Configure the lock screen (or the system wide configuration) to use 24-hour clock?
  2. Remove the clock altogether?
share|improve this question
I know this is nitpicking, you can tell that I get along with my MBP if this is the kind of things I'm worried about :) But still... AM/PM indicators annoy me (mostly because I've never taken the time [no pun intended] to learn them properly) – Lasse V. Karlsen Oct 16 '11 at 15:25
This definitely sounds like a bug (I just repro'd it on my computer). Please file a bug report at – Dave DeLong Oct 16 '11 at 16:01
up vote 4 down vote accepted

Since at the login window (and the lock screen) your user is not logged in, you´ll have to edit the global preferences:

sudo defaults write /Library/Preferences/.GlobalPreferences AppleLocale en_GB


sudo defaults write /var/root/Library/Preferences/.GlobalPreferences AppleLocale en_GB

and then do a reboot. This fixed it for me (and I hope, Apple fixes that sooner or later). :-)

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.