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I'm not sure about doing it via the app. If you can't then you can via the web interface in your profile settings at https://www.fitbit.com/user/profile/edit
Once changed and saved the next time you sync your fitbit will be updated.
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Welcome to the Community @E_SOAP59 and @SteveH thanks for stopping by. As mentioned, there's not an option to change the time to 24 or 12 hours from the Fitbit app. I took the liberty and searched for a request like this but didn't find any, I recommend visiting our feature suggestions board and share this idea.
In the meantime, you can follow our friend's instructions and change it from a computer by doing the following:
1. Go to Settings
2. Go to Personal Info
3. Scroll down to Time
4. Select 24 hour
5. Save
6. Sync
See you around. ![]()
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