Casio 5518 User guide

Firstly, make sure it is in the Timekeeping Mode.
DST Setting Module : 5229/5518
City Code
NYC
9:10
36
Hour, Minutes, Seconds
Day of week
1.
<Timekeeping Mode Screen>
If you don't know which mode it is,
press (C) button to change the mode.
In the Timekeeping Mode, hold down
(A) button for three seconds until the
currently selected city code flashes.
DST
9:10
on
Press (C) button once.
Current DST setting will appear.
DST Indicator
2.

DST
8:10
OFF
4.
DST
9:10
on DST
8:10
OFF
Use (D) button to toggle ON and OFF.
3
Press (A) button to exit the setting mode.