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On the computer: Go to the Dashboard and click on the gear and choose settings from the drop down. Scroll down to time zone Change it to a different one. Sync it. Go back in and change it to the correct one and sync again
Phone: Click on account upper top right looks like an envelope. Scroll down to advanced settings and do the same as above
Device will need to sync before it changes
Also check your computer and phone to make sure the time is correct on it as well.
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@Kathy30 Welcome to the Fitbit family! Thanks for posting your inquiry about the date on your tracker on this thread.
Did you tried @WendyB steps on her post above? Are you still experiencing the same?
You can find more steps about changing date and time here.
Keep me posted! 
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