Right click on your time & date on your task bar. on the pop up menu left click on adjust time/date. Then left click on change time zone. Left click on the drop down menu that has your current time zone displayed. You can scroll up or down on the list & left click on the time zone you want to use for your computer. Pacific US time is there between Arizona & Baja California. right now it is UTC -7, the end of October it will be UTC -8.