Lexus GS430 User Manual page 132

INTERIOR EQUIPMENT
(a) To adjust a clock
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You can adjust the clock manually with "H", "M" and ":00"
switches.
"H": To set the hour.
"M": To set the minute.
":00": To adjust the time to the nearest hour.
For example, if the ":00" switch is pressed when the time is
between 9:30 − 9:59 or between 10:01 − 10:29, the time will
change to 10:00.
If the electrical power source has been disconnected from the
clock, the time display will automatically be set to 1:00.
After adjustment, touch "OK".
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(b) To set the daylight saving time
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You can set or cancel the daylight saving time.
"ON": To set the daylight saving time.
"OFF": To cancel the daylight saving time.
After setting, touch "OK".