In Ubuntu 17.10 with GNOME, how do I change the clock to a 12 hour format? And maybe for a more difficult rhetorical question, why does Ubuntu feel compelled to hide such basic functionality?

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    To answer the second part of your question, that was not done by Ubuntu, but by GNOME developers. – pomsky Nov 3 '17 at 15:43

Click on Activities and search for "Settings" and launch it. Click on Details at the bottom of the sidebar and then select "Date & Time".

You'll find an option to change the time format.

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For an option with more customisations, you may use a GNOME shell extension called "Clock Override" as mentioned in my answer here.

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    Confirmed, works in Ubuntu 18.04 also. – agm1984 Aug 8 '18 at 5:07
  • Why would they put this under "Details"?? What does clock have to do with details? This whole new settings user interface is just trash. – darksky Jul 2 at 21:07

In search bar, search for "Time" and the "Date & Time" setting comes up, click on it and change to "AM/PM".

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