My Sister has a Fitbit watch. After charging it the date and time were wrong. To fix this you will need the Fitbit app installed on your smartphone and Bluetooth enabled.
Note: I haven’t tried this out yet, but it might also work on a Chromebook.
Your Fitbit device must remain near your phone to sync.
Open the app. Log in to your account.
At the bottom of the screen, make sure “Today” is selected. Then swipe down slightly on the screen. Across the top, you’ll see a message to “Release to sync”.
Remove your finger and your Fitbit app will automatically start syncing with your watch. The dark green you see across the top in my example is the progress bar. Give it a minute.
During the sync, it will update the date and time on your watch.
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