Click "Start" and then click on "Control Panel." If you are using an older version of Windows. click "Start," point to "Settings" and then click on "Control Panel."
Step 3
Double click "Regional and Language Options" in your "Control Panel."
Step 4
"Regional Options" tab. Under "Standards and Formats", click "Customize."
Step 5
Click on the "Time" tab, and click any changes you want to make.
Step 6
When you are finished, click "Apply" and "OK" on the "Customize Regional Options" dialog. Then click "Apply" and "OK" on the "Regional and Language Options" dialog box.