Here, straight from the Kenwood manual (sheesh its cold outside, just went out and got it for you!):
First, setting the time
1) Enter Menu mode
Press the MENU button for at least 1 second.
2)Select the menu item
Press the FM or AM button, select Clock Adjust
3)Set the menu item
Press the << or >> button for at least 1 second
The clock display should blink
4)Adjust the Hours
Press the FM or AM button.
5)Adjust the Minutes
Press the << or >> button.
Exit clock adjustment mode
Press the MENU button.