Change Date Format to DD-MMM-YY in Sonoma

I tested this in Sonoma. Try this and then restart Finder (quit it via Activity Monitor, for example) or re-log in (AFAIK these 1-2-3-4 set the format to short-medium-long-etc display settings):

defaults write NSGlobalDomain AppleICUDateFormatStrings -dict-add "1" "ddMMMyy"

defaults write NSGlobalDomain AppleICUDateFormatStrings -dict-add "2" "ddMMMyy"

defaults write NSGlobalDomain AppleICUDateFormatStrings -dict-add "3" "ddMMMyy"

defaults write NSGlobalDomain AppleICUDateFormatStrings -dict-add "4" "ddMMMyy"

Revert to the default:

defaults delete NSGlobalDomain AppleICUDateFormatStrings

macOS Ventura 13.0 - Language Region - Da… - Apple Community

https://gist.github.com/chris-79/654bfcd252280230fa82

For example, in Finder lists this "3" option gives:

defaults write NSGlobalDomain AppleICUDateFormatStrings -dict-add "3" "ddMMMyy"

...while the default is:

System Settings > General > Language & Region. Change the Date format in the drop down menu.

In case I wasn't clear, the option to customize the date format was removed as of Ventura.

Thanks—It works for Finder, and a lot of other apps, but not for:

• Reminders: in the main panel it works, but in the information panel it does not
• Maps: when getting directions in the Plan tab, it does not
• News
• Messages
• Contacts
• Podcasts
• Books: Release Date
• Stocks
• Weather
• Menubar Date

Entropy wins.

"This is what customers pay us for - to sweat all these details so it's easy and pleasant for them to use our computers." —Steve Jobs

The Apple with that attitude is gone.

You're welcome. If you mean there is no longer an abbreviation for the month, that's correct.

You can send Apple feedback about the change. I wouldn't expect it to change anytime soon, if ever.

Feedback - macOS - Apple

Here's an example of how absurd this is in the Reminders information panel:

My Region is set to Canada, and my date format is ISO-8601 (the official date format of Canada).

But Apple has decided to tell me what's best for me.

Yea, I would have in finder list view, as I had this possible for the long date in Monterey, but no more since Ventura

"Monday, 01 December 2023 at 13:23". or/and

"Monday, 01-12-2023 at 13:23"

I wonder if there is a Terminal Command for this too ...

Add to the list of things this change has broken:

• Custom macros like those used by Alfred to construct specific date strings: {date:medium}_{time:short}

My workflows for quickly generating date and times for database entries and filenames no longer work. This is a bad change for power users without some workaround.