Change from AM/ PM to 24 hour

Some of my cameras is showing meridiem am/pm.
Other 24 hours.
There can I change to 24 hours ?
I have true to press “Sync Time” ,but don’t help

Have you tried rebooting them?

Are you talking about the on screen display in the lower right corner of the video or something else?
The on screen display it always 24 hour time (unless something changed), and pretty much everything else follows the setting of your phone clock display.

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Yes I have press “Restart”

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Could you send a screenshot of where you are seeing this?

Try unplugging it waiting a few minutes, then plugging it back in. Sometimes this works better than restarting the camera via the app.