Theoretically the Fitbit should keep the time updated though syncing, but there are some things that throw it off. I would try these steps in this order. Check after each step to see if you have the correct time before doing the next step.
1. Re-sync your Alta to your phone/computer
2. Check your settings on your dashboard to make sure you have the correct time zone selected.
3a. If you sync to a phone make sure you do not need to update the app then try disconnecting and reconnecting the Fitbit (in your Bluetooth settings).
3b. If you are syncing to a computer, then try re-syncing your Fitbit. you might need uninstall/reinstall your software and make sure you are running the most recent version.
4. Try removing the Alta in the Fitbit app (should be under device settings) and then reconnecting it.
Hopefully one of those steps will get you on the right time, but if not, try resetting your Alta by doing the following:
- Plug in your Alta in a USB (computer, or adapter) as you normally would to charge it. It should begin charging.
- Press the button on your charging cable three times within eight seconds, briefly pausing between presses. (The button is on the end of the charging cable).
- Eight seconds after the first button press, you'll see the Fitbit logo on the screen. This means Alta is restarting.
- After you see the logo you can unplug your tracker from the charging cable.