After more than 15 years covering everything Apple, it’s with a heavy heart we announce that we will no longer be publishing new content on iMore and the iMore forums will be closing as of November 1st, 2024.
Open the Fitbit app on your phone, then tap the Account icon in the bottom right. Scroll down to Advanced Settings, and make sure "Set Automatically" is enabled, and the correct time zone is listed. Then sync your device. It should pull the correct time from your phone.