Your meter comes with the batteries already installed and a preset time and date. You may need to change the time to match your time zone, or if you live in a state that observes daylight saving time, to reflect the time change.
How to change the time and date on the Accu-Chek Aviva meter
This video shows you how to set the time and data on the black Accu-Chek Aviva meter.
How to change the time and date on the Accu-Chek Nano meter
This video shows you how to set the time and date on the Accu-Chek Nano meter.