The Language & Region Settings I configured for the UK, as follows: Localisation/Internationalisation formats screenshot

Yet the Panel shows the Date in format: 'Tue May 8'

Is there a trick I'm missing?

Also, I don't see anywhere to further customize the date format using the codes, eg. %Y-%m-%d (for ISO 8601 date format)

I have noted that there is a GNOME Shell Extension: Datetime Format, which appears to allow further customisation, but I'd rather use the core functionality if at all possible.

This is a similar question to this one, but the 17.10 question goes unanswered, and I got the impression that GNOME in 17.10 was somewhat early-access and perhaps not fully formed.

Update: There is a way (without extension) to achieve a date and time format of your choosing by editing and implementing the appropriate gnome.desktop localisation LC_MESSAGES file, as described here

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    If I'm not mistaken it's default behaviour, probably GNOME developers haven't thought of implementing format as per locale settings yet. Consider reporting a bug. It seems currently no other way than using some extensions. – pomsky May 8 '18 at 7:48
  • Hurray for ISO 8601 date format! So, did you prefer the Clock override approach or the DateTime format approach? – GlenPeterson May 1 '19 at 20:53
  • I'm curious. Does this work? dconf write /org/gnome/shell/extensions/panel-date-format/format "'%Y-%m-%d'" taken from extensions.gnome.org/extension/1462/panel-date-format – GlenPeterson May 1 '19 at 20:56
  • If you're just interested in ISO-8601 for IntelliJ IDEA, edit bin/idea.sh to add this line: export LC_TIME=sv_SE - that worked for me! Source: youtrack.jetbrains.com/issue/… – GlenPeterson May 1 '19 at 21:15

It seems to be an issue with GNOME shell.

But you can override the date format using a GNOME shell extension called Clock override. It lets you

Override the Gnome Shell clock with a new time format or text of your choice.

It supports Python's strftime format (so you'll be able to set your preferred "%d/%m/%y" format to display).

enter image description here

  • Many thanks pomsky, so you would choose Clock Override over Datetime Format... is that just a choice or based on functionality/security/etc? – Broadsworde May 8 '18 at 8:12
  • @Broadsworde I believe both can be used achieve the same thing in a similar way. I just mentioned Clock Override in the answer as you've already mentioned Datetime Format in the question. – pomsky May 8 '18 at 8:34
  • Thanks again pomsky. I have reported a bug as you suggested (bugzilla.gnome.org/show_bug.cgi?id=795912) – Broadsworde May 8 '18 at 9:11

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