In this tutorial, we learn how to set the onboard clock in a 2010 Prius. To the left of the audio system are the clock buttons. To set this, press repeatedly or press and hold the "h" or "m" button to change the hours or minutes. Then, you will be able to set the correct time. Above the clock buttons is a switch that will change your reading from miles per hour to kilometers per hour. The controls on the Prius are completely customizable so you can control what you see on your car and when. Make sure you're not driving when you do this to maintain safety.