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I've noticed that the en_AU locale is defaulting to 24 hour time, it should be 12 hour as this is most commonly used in Australia.

How can this be adjusted?

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Have you not tried the Time & Date Settings? –  Mitch Jun 2 '12 at 6:50

3 Answers 3

Got to the symbol at the bar at the top of your screen where the time is displayed and click. Go to 'Time and Date Settings' (or similar). A settings screen will pop up. Choose the 'Clock' tab.

Alternatively go to System Settings, then Choose 'Time and Date' and then the 'Clock' tab.

You can now choose between 12 and 24 hour day.

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Thanks, I realise I can change the display but this does not change the locale settings, which is used by programs such as Thunderbird and Lightning. Is there a way I can change the locale for en_AU to use 12 hour time? –  Alex Jun 3 '12 at 8:33

To check which locale you currently have as your default

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the commands below.


Changing the default locale is a little different on Ubuntu compared to most Linux distros, these are the steps we needed to go through to get it changed Click Here

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how to do it

Restart as mentioned Customize using the above link. Check this solution as done earlier previous issue

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