Welcome to the Fitbit Community, @sven-wlms.
I appreciate your participation in the Forums and sharing your concern about the 24 hour clock on your son's Ace 2. Thanks for the details provided, I am glad to assist you with that. In order to help you better, could you please confirm the issue with the tracker? Does it show 24 hour clock during the night?
Meanwhile, you can try doing the following:
1. Restart the tracker by following the steps from this help article: How do I restart my Fitbit device?
2. Change the clock face:
- With the tracker nearby, from the Fitbit app dashboard, tap the account icon> Ace 2 tile.
- Tap Clock Faces > All Clocks.
- Browse the available clock faces. Tap a clock face to see a detailed view.
- Tap Select to add the clock face to Ace 2.
You can find more information about the Ace 2 in this manual.
Looking forward to hearing back from you.
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