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There seems to be a logic bug within the Settings display screen in Sonoma which means the toggles must be flipped about earlier than the setting takes maintain. When the outdated Preferences display screen was rewritten utilizing SwiftUI there have been fairly a number of grumbles about inconsistent logic. That is most likely one that’s nonetheless excellent.
Notice, this settings pane has modified for the reason that linked reply within the OP’s query to incorporate the Present 24-hour time on lock display screen toggle. This reply is re. macOS 14.4
Preliminary situation:
Login display screen exhibits time in 12-hour format.
Settings exhibits each toggles off, and time in 12-hour format.
Toggle 24-hour time. There is no such thing as a change within the clock format. When you have been to logout now, instantly anticipating change, there can be no change on the login display screen.
Toggle Present 24-hour time on lock display screen. Once more no change in format. Apparently that is the one place when Settings decides it wants admin authority…
Toggle 24-hour time off (from a programming logic POV this turn-off also needs to flip off the opposite toggle, however…). No change:
Toggle 24-hour time on. The time is now displayed in 24-hour format:
When you now logoff, the login display screen shall be in 24-hour format (as will the lock display screen).
It appears 24-hour time has no impact except accompanied by the lock display screen toggle. I perceive what they’re attempting to realize with the separation, however it has been poorly carried out.
The lock display screen toggle does certainly management the setting on the login display screen.
One different small commentary, the 24-hour settings additionally management how date & time are persistently saved and displayed for information in Finder. I discovered this whereas importing these attachments. Recordsdata saved whereas the system is in 12-hour format nonetheless have 12-hour format displayed in Finder even when the system is in 24-hour format. And vice-versa.
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