TOYOTA 2011 Yaris Sedan - Manual (Page 224)

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3-5. Other interior features
Clock
n The clock is displayed when
The engine switch is in the ON position.
n When disconnecting and reconnecting battery terminals
The time display will automatically be set to 1:00.
Press and hold the CLOCK button to enter the adjustment
mode for the clock.
Press the CLOCK button to adjust the hours.
After adjusting the hours, wait 5 seconds to allow the hours to be
automatically input.
Press the CLOCK button to adjust the minutes.
After adjusting the minutes, wait 5 seconds to allow the minutes to
be automatically input and then return to normal mode.