Casio 2578 User Manual Download Page 3

USER’S GUIDE 2578

3

World Time

The World Time shows the current time in 30 cities (29
time zones) around the world.
• If the current time shown for a city is wrong, check your

Home City time settings and make the necessary
changes.

• You can use the Time Setting Mode to change the DST

(summer time)/Standard Time settings for each city
code.

• The watch will perform a signal receive operation even if

it is in the World Time Mode when a calibration time is
reached. If this happens, the World Time Mode time
settings will be adjusted in accordance with the
Timekeeping Mode’s Home City time.

• The World Time Mode always displays times using 24-

hour format, regardless of the 12-hour/24-hour format
setting in the Timekeeping Mode.

Home city
time

DST
indicator

City Code

Current time in the
selected city code

To view the time in another city
1. From the Timekeeping Mode, use 

C

 and 

A

 to display 

WT

 (World Time Mode)

in the text area.

2. Press 

B

 to enter the World Time Mode.

3. Press 

C

 to scroll the city codes (time zones) in the text area to the east or 

A

 to

scroll to the west.

• For full information on city codes, see the “City Code Table.”

To exit the World Time Mode
In the World Time Mode, press 

B

 and the text area shows the World Time Mode

indicator (

WT

).

• After returning to the World Time Mode indicator (

WT

), you can use 

C

 and 

A

 to

change to another mode.

Alarms

The Alarm Mode gives you a choice of four one-time
alarms and one snooze alarm. One of the one-time
alarms functions as a “target alarm,” which counts the time
remaining from the current Home City time to the target
alarm time.
Also use the Alarm Mode to turn the Hourly Time Signal
on and off.
• There are five alarms named 

AL1

AL2

AL3

TAL

(target alarm), and 

SNZ

. The alarm names appear in

the text area of the display.

• You can configure 

SNZ

 as a snooze alarm only.

Alarms 

AL1

AL2

AL3

, and 

TAL

 can be used as

one-time alarms only.

To enter the Alarm Mode
1. From the Timekeeping Mode, use 

C

 and 

A

 to display

ALM

 (Alarm Mode) in the text area.

2. Press 

B

 to enter the Alarm Mode.

Home
city time

Alarm time
(Hour : Minutes)

Text area
(Alarm name)

To set an alarm time

1. Enter the Alarm Mode.
2. Use 

C

 and 

A

 to scroll through the alarm name

screens until the name of one whose time you want to
set is shown in the text area.

3. After you select an alarm, press 

B

. This causes the

alarm’s on (

ON

) /off (

OF

) setting to flash, which

indicates the setting screen.

4.  Press 

C

 or 

A

 to turn the alarm on.

• Note that the above step is necessary when you want

to set the alarm time. You cannot change the alarm
time setting while an alarm is turned off.

AL1

AL2

AL3

SIG

SNZ

TAL

Press 

C

.

/Press 

A

.

On/off status

5. Use 

B

 to move the flashing between settings as

shown below.

• Note that the hour and minutes do not appear if the

alarm is turned off.

6. While the on/off setting is flashing, press 

C

 or 

A

 to

toggle it on (

ON

) and off (

OF

).

7. While the hour or minute setting is flashing, use 

C

 (+)

and 

A

 (–) to change it.

8. After setting the minutes, press 

B

 twice to return to the

alarm name screen.

• With the target alarm (

TAL

), the time starts to

countdown as soon as you set the alarm time.

Countdown
(Hours : Minutes Seconds)

Target Alarm Screen

Minutes

On/Off Setting

Hour

Alarm Mode 

(

ALM

) Screen

Alarm Name Screen 

Note
• When setting the alarm time using the 12-hour format, take care to set the time

correctly as a.m. (no indicator) or p.m. (P indicator).

Alarm Operation

The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in. In the case of the snooze alarm, the alarm operation is performed a total
of seven times, every five minutes, until you turn the alarm off.
The target alarm counts the time remaining from the current Home City time to the
target alarm time.
• Pressing any button stops the alarm tone operation.
• Performing any one of the following operations during a 5-minute interval between

snooze alarms cancels the current snooze alarm operation.

Displaying the time setting screen
Displaying the alarm setting screen

To test the alarm
• In the Alarm Mode, hold down 

C

 to sound the alarm.

To turn an alarm on and off

1. Enter the Alarm Mode, and then use 

C

 and 

A

 to

display the alarm name screen of the alarm you want.

2. After you select an alarm, press 

B

 and the alarm’s on/

off setting (

ON

 or 

OF

) starts to flash, which indicates

the setting screen.

3. While the on/off setting is flashing, use 

C

 or 

A

 to

toggle it on (

ON

) and off (

OF

).

4. Press 

B

 to return to the alarm name screen.

• If the alarm is on, press 

B

 four times. If the alarm is off,

press 

B

 twice.

• The snooze on indicator (

) flashes during the 5-

minute interval between alarms.

• The alarm on indicator (

) and snooze on indicator

(

) are displayed in all modes.

• In all modes, the alarm on indicator is shown for any

alarm (

AL1

AL2

AL3

TAL

SNZ

) that is

currently turned on.

Snooze on
indicator

Alarm on
indicator

On/off status

To turn the Hourly Time Signal on and off

1. Enter the Alarm Mode, and then use 

C

 and 

A

 to

display Hourly Time Signal setting screen (

SIG

).

2. Press 

B

. This causes the on (

ON

) /off (

OF

) start to

flash, which indicates the setting screen.

3. While the on/off setting is flashing, use 

C

 or 

A

 to

toggle it on (

ON

) and off (

OF

).

4. Press 

B

 twice to return to the alarm name screen.

• The Hourly Time Signal on indicator (

) is displayed

in all modes when the Hourly Time Signal is turned on.

To exit an Alarm Name Screen
To get from an alarm name screen to the initial Alarm Mode (

ALM

) screen, you need

to press 

B

 to cycle through the alarm settings.

How many times depends on whether the currently displayed alarm is on or off as
shown below.

Hourly time signal
on indicator

On/off status

• Alarms (

AL1

AL2

AL3

TAL

SNZ

)

Alarm On:

Alarm Name

Screen

Alarm Mode

(

ALM

) Screen

Alarm On

(

ON

)

Hour

Minutes

Alarm Off:

Alarm Name

Screen

Alarm Mode

(

ALM

) Screen

Alarm Off

(

OF

)

• Hourly Time Signal (

SIG

)

Signal On or Off:

Alarm Name

Screen

Alarm Mode

(

ALM

) Screen

Signal 

On (

ON

) /Off (

OF

)

• After returning to the Alarm Mode (

ALM

) screen, you can use 

C

 and 

A

 to change

to another mode.

Date Alert

Date Alert helps you to remember an important date. After you set an alert date
(month and day), a date alert indicator (!) and the current date flash for 24 hours after
the alert date arrives in the Timekeeping Mode. You can set up to five different date
alerts.

To enter the Date Alert Mode
1. From the Timekeeping Mode, use 

C

 and 

A

 to display 

D/A

 (Date Alert Mode) in

the text area.

2. Press 

B

 to enter the Date Alert Mode.

Alert Date
(Month-Day)

Home city
time

On/off status

Text area
(Alert name)

Current date
(Month-Day)

Date alert on
indicator

Date Alert Mode Screen

Timekeeping Mode Screen

To set the alert date

1. Enter the Date Alert Mode, and then use 

C

 and 

A

 to

scroll through the alert name screens until the one
whose date you want to set is displayed.

2. After you set an alert, press 

B

. This causes the on

(

ON

) /off (

OF

) setting to start to flash, which indicates

the setting screen.

3. Press 

B

 to move the flashing in the sequence shown

below.

On/off status

DA1

DA2

DA3

DA5

DA4

Press 

C

.

/Press 

A

.

• Note that the month and day do not appear if the alert is turned off.

4. While the on/off setting is flashing, press 

C

 or 

A

 to toggle it on (

ON

) and off (

OF

).

5. While the month or day setting is flashing, use 

C

 (+) and 

A

 (–) to change it.

6. After setting the day, press 

B

 twice to return to the alert name screen.

To exit an Alert Name Screen
To get from an alert name screen to the initial Date Alert Mode (

D/A

) screen, you

need to press 

B

 to cycle through the date alert settings.

How many times depends on whether the currently displayed date alert is on or off as
shown below.

Day

Alert On/Off

Month

Date Alert Mode

(

D/A

) Screen

Alert Name 

Screen

Alert date

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