Casio module 5081

1. In the Timekeeping Mode, hold A for about three seconds until the city code flashes.
2. Press C to step through the settings: city code, DST, 12/24-hour format, seconds, hour, minutes, year, month, day, then light duration.
3. On the seconds, press D to reset them.
4. On the hour, minutes, year, month or day, press D to go up and B to go down.
5. On the 12/24-hour format, press D to switch.
6. Press A to leave the setting mode.

From Casio's guide, page 1

1. In the Timekeeping Mode, hold A for about three seconds until the city code flashes.
2. Press C once to reach the DST setting.
3. Press D to switch DST on or off.
4. Press A to leave. The DST indicator shows while summer time is on.

From Casio's guide, page 1

1. In the Timekeeping Mode, hold A for about three seconds until the city code flashes.
2. Press D to move east or B to move west through the city codes.
3. Press A to leave.

From Casio's guide, page 1

1. Press C until the Alarm Mode shows.
2. Press D to pick the alarm: AL1 to AL4, or SNZ for the snooze alarm.
3. Hold A for about three seconds until the hour flashes; this also turns the alarm on.
4. Press D or B to set the hour, press C to move to the minutes, then D or B again.
5. Press A to leave.

From Casio's guide, page 3

1. In the Timekeeping Mode, hold D for about three seconds until H-SET and Sub appear.
2. If the speed hand is not at 50 (12 o'clock), press D to move it there, then press C.
3. If the hour and minute hands are not at 12 o'clock, press D (clockwise) or B (counterclockwise) until they are.
4. Press A to go back to normal timekeeping.

From Casio's guide, page 4

1. Press B in any mode to light the display.
2. To change the duration: in the Timekeeping Mode hold A until the display flashes, then press C nine times.
3. Press D to switch between LT1 (1.5 seconds) and LT3 (3 seconds).
4. Press A to leave.

From Casio's guide, page 3

1. Press C until the Stopwatch Mode shows.
2. With the stopwatch at zero, press A until SPL shows (LAP is for lap times).
3. Press D to start and D to stop; press D again to resume.
4. When stopped, press A to reset.

From Casio's guide, page 2

1. Press C until the Countdown Timer Mode shows.
2. With the start time shown, hold A for about three seconds until the hour flashes.
3. Press C to move between hours, minutes and auto-repeat; press D or B to change the time, D to switch auto-repeat.
4. Press A to leave, then press D to start and D again to pause.
5. To reset, pause it with D and press A.

From Casio's guide, page 2