Is it possible to make the clock to show 0900
instead of 9:00
for 9AM? I’ve already tried changing the format under System Preferences → Language & Region → Advanced… but the setting doesn’t save.
MacOS – How to change 24hr Time format
clockmacostime
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Best Answer
It cannot be done.
It looks like you can, but in fact it doesn't affect the menu bar clock.
System Prefs > Language & Region > Advanced... > Times
Changing the format in here, you'd expect it to affect the menu bar clock... but in fact it affects timestamps shown in Finder windows only.
There is no equivalent Advanced mode in Date & Time