How do I change the date format in Gnome 3 shell?

Posted by James Haigh on Ask Ubuntu See other posts from Ask Ubuntu or by James Haigh
Published on 2013-06-24T15:13:46Z Indexed on 2013/06/24 16:37 UTC
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I want to change the date/time format on the top panel to a format close to RFC 3339 / ISO 8601, like one of these:

%F %T ? 2013-06-24 16:13:00

%F %a %T ? 2013-06-24 Mon 16:13:00

%A %F %T ? Monday 2013-06-24 16:13:00

I know Unity has a preference somewhere hidden away in dconf, this is how I did it in Unity, but I can't find such a preference for Gnome 3 shell. Preferably, I'd also like to set one of these as my system-wide date/time locale preference.

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