How do you reset the time on a fit bit zip? - Fitbit Zip Wireless Fitness Tracker

Go to your account settings, then advanced settings. Turn off the automatic timezone setting, and then adjust the time as you wish. don't forget to sync

hi Sonja.
How do I change the time and date on my Fitbit?

1. From the Fitbit app dashboard, tap or click the Account icon ( ).
2. Tap or click Advanced Settings.
3. Tap or click Time Zone.
4. Turn off the Auto option and select the correct time zone.
5. Sync your tracker.

Help article: How do I change the time on my tracker? - Fitbit Help

https://help.fitbit.com/articles/en_US/Help_article/1176 Search for: How do I change the time and date on my Fitbit?
or read up more at this link.
How to reset time and date on fit bit watch Google Search

https://community.fitbit.com/t5/Zip/How-do-I-setup-two-accounts-on-the-same-iPad/td-p/1074393


This discussion board will give you the answer you're looking for.

you have to resync it with the dongle plugged into a computer.
was it a fitbit zip ? if yes then
you will have to take battery out and then put back in. for about two minutes you will be able to hook it up to a pc via the dongle and fit bit software .As it goes into pairing mode . for about two minutes from having battery inserted.

just pull battery back out and place battery back in and then reconnect it to app. If it is similar to fit bit zip there is a limited time frame to re connect it to app once battery inserted.

What Fitbit do you have?
Does it Charge up?
I would suggest doing a restart of your Fitbit.

• Clock/Time (Fitbit Ultra only)
  
  
  
  
  
  • The current time can be viewed on the Fitbit Ultra's display.
  
  
  
  • The time can be displayed in 12 hour format (e.g., 5:00 PM) or 24 hour format (e.g., 17:00). You can adjust this setting on the Edit Profile page, which affects the displayed time on the Fitbit Ultra, graphs, and input fields across the site.
  
  
  
  • The clock display can be disabled from the Fitbit Ultra setup screen.
  
  
  
  

It looks like Amazon came up with a name "zip gun hammer" A zip gun is a low profile gun with bullets. The cp716 is a good model. Make sure to get the bits with it. These air hammers do not come with bits most times.

good luck

Joe