05 Echo changing time on clock

[jambo101]

OK its not a Yaris but i thought maybe a former Echo owner remembers how to change the time on an 05 Echo. the radio unit is that odd one that came with no lights for the buttons,at night only the screen lights up.
Heres the radio, that button that says clock only changes the display from clock to channel. i;ve tried many combination's of holding 2 buttons at the same time and also holding the clock button itself for various time periods. havent found the trick yet..