Firstly, make sure it is in the Timekeeping Mode.
DST Setting / Module : 5637
<Timekeeping Mode Screen>
To return to the Timekeeping Mode,
hold down Ⓒfor two seconds.
In the Timekeeping Mode,
hold down Ⓐuntil the city
code starts to flash.
Press Ⓓto toggle
ON and OFF .
Press Ⓒonce to display
the DST setting mode.
Day of the week
Date
City code
ON or OFF