Garmin Vivofit watches have a built-in timekeeping system that allows you to track your time and date. To change the time on your Vivofit watch, you must first remove the battery and insert a new one. Once the battery is inserted, press and hold the power button for about 10 seconds to turn on the Vivofit watch. Then, use the touchscreen to select “Time” from the menu. To change the time on your Vivofit watch, you must first remove the battery and insert a new one. Once the battery is inserted, press and hold the power button for about 10 seconds to turn on the Vivofit watch. Then, use the touchscreen to select “Time” from the menu.