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Just break my M1 MBP Pro by updating to Ventura 13.6.1. Black screen and every time hold on to Power Button, trying to go to option screen and went dark again.
Exactly this happened to my MBP 14-inch M1 on updating Monterey from 12.6.9 to 12.7. I had the machine restored (not revived) in the Apple Store using Apple Configurator but with Sonoma 14.0. I formatted the disk and installed clean 12.7. The same thing happened. I returned to the Apple Store and had Sonoma 14.0 again, which I still have. It is stable with a bug in Image Capture (image correction != none obscures other controls). Looking here to see if 14.1 is OK. Like me, you may have to visit an Apple Store to fix your MBP.
 
@GeertGB not sure if you are on the MacAdmins Slack but if you are this is the thread

Basically Apple switched the data it writes to the AppleLocale key in your users' .GlobalPreferences domain.

I opened an Apple FB and it is "working as intended" Apple says, they say that no app should be getting the region from AppleLocale in .GlobalPreferences and instead use Swift/ObjC APIs.... well I guess Microsoft didn't get the memo!

So in your case if you are using English US for the language and Netherlands for the region, if you run this command:
Code:
defaults read .GlobalPreferences AppleLocale

You'll likely get this as the result: en_US@rg=nlzzzz
If you were on Ventura or earlier, it'd be: en_NL

So for now, until MS fixes how they are getting regions, you can revert to the old format, run this in Terminal as the current user (not root):
Code:
defaults write .GlobalPreferences AppleLocale en_NL

Relaunch Excel and it should realize where you are and give you proper date formatting and unit separators
FYI: Alternative workaround I use is just set the Region/Language settings in Mac OS to English(UK) that also is working (and sets the AppleLocal to en_NL)
 
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