Operation Guide 3585
EN-9
CC
C
Stopwatch Mode Timer Mode Alarm Mode
EN-8
Selecting a Mode
x Press C to change from mode to mode.
x In any mode (except when a setting screen is on the display), press B to illuminate
the display.
C
Timekeeping Mode World Time Mode
C
EN-7
Watch Features
You can also find information
about operational procedures
at the CASIO website.
https://s.casio.jp/mw/en/3585/
◆
World Time
◆
Stopwatch
◆
Timer
◆
3 multi-function alarms, Hourly Time
Signal
EN-6
To test the alarm ................................................................................................ EN-32
To turn an alarm on and off ............................................................................... EN-33
To turn the Hourly Time Signal on and off ....................................................... EN-34
To illuminate the display .................................................................................... EN-36
To specify the illumination duration ................................................................. EN-36
To turn Flash Alert on and off ........................................................................... EN-38
To turn the button operation tone on and off ................................................. EN-39
EN-5
Procedure Lookup
The following is a handy reference list of all the operational procedures contained in
this manual.
To set the time and date .................................................................................... EN-12
To toggle the Timekeeping Mode time between DST and Standard Time ... EN-15
To toggle between 12-hour and 24-hour timekeeping ................................... EN-16
To view the time for another city code............................................................. EN-17
To toggle a city code time
between Standard Time and Daylight Saving Time .................................... EN-18
To measure times with the stopwatch ............................................................. EN-20
To use Auto-Start ............................................................................................... EN-21
To configure the timer ....................................................................................... EN-25
To use the timer.................................................................................................. EN-27
To set an alarm time .......................................................................................... EN-30
EN-4
Specifications ..................................................................................................... EN-43
EN-3
Contents
About This Manual................................................................................................ EN-2
Watch Features ..................................................................................................... EN-7
Selecting a Mode .................................................................................................. EN-8
Timekeeping ....................................................................................................... EN-11
World Time .......................................................................................................... EN-17
Stopwatch ........................................................................................................... EN-19
Timer .................................................................................................................... EN-22
Alarms.................................................................................................................. EN-28
Illumination .......................................................................................................... EN-35
Reference ............................................................................................................ EN-37
EN-2
About This Manual
x Button operations are indicated using the letters shown
in the illustration.
x Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.
EN-1
ENGLISH
You can also find information about
operational procedures at the CASIO website.
https://s.casio.jp/mw/en/3585/
MA2509-EA
© 2025 CASIO COMPUTER CO., LTD.
Published: 9/2025
Operation Guide 3585
EN-19
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes. It also includes Auto-Start.
x The display range of the stopwatch is 23hours,
59minutes, 59.99seconds.
x The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
x The stopwatch measurement operation continues even if
you exit the Stopwatch Mode.
x Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
x All of the operations in this section are performed in
the Stopwatch Mode, which you enter by pressing C
(page EN-9).
1/100 second
Seconds
Hours Minutes
EN-18
To toggle a city code time between Standard Time and Daylight Saving Time
1. In the World Time Mode, use D to display the city code
whose Standard Time/Daylight Saving Time setting you
want to change.
2. Hold down A for at least one second to toggle Daylight
Saving Time (DST displayed) and Standard Time (DST
not displayed).
x The DST indicator is on the display whenever you
display a city code for which Daylight Saving Time is
turned on.
x Note that the DST/Standard Time setting affects only
the currently displayed city code. Other city codes are
not affected.
DST indicator
EN-17
World Time
World Time shows the current time in 48 cities (29 time
zones) around the world.
x All of the operations in this section are performed in
the World Time Mode, which you enter by pressing C
(page EN-8).
To view the time for another city code
In the World Time Mode, press D to scroll eastwardly
through city codes.
x For full information about city codes, see the “City Code
Table” at the back of this manual.
x If the current time for a city is wrong, check your
Timekeeping Mode time and the UTC offset settings and
make necessary changes.
City code
Current time and date
in selected city
EN-16
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press D to toggle between 12-hour timekeeping and
24-hour timekeeping.
x With the 12-hour format, the P (PM) indicator appears to the left of the hour digits
for times in the range of noon to 11:59 p.m. and no indicator appears to the left of
the hour digits for times in the range of midnight to 11:59 a.m.
x With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
x The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
EN-15
To toggle the Timekeeping Mode time between DST and Standard Time
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C to display the DST setting screen.
3. Press D to toggle between Daylight Saving Time
(
displayed) and Standard Time ( displayed).
4. Press A to exit the setting screen.
x The DST indicator appears on the display to indicate that
Daylight Saving Time is turned on.
DST indicator
EN-14
x For details about the UTC offset, see the “City Code Table” at the back of this
manual.
x The UTC offset setting range is –12.0 to +14.0, in 0.5-hour units.
x When DST is turned on, the UTC offset setting range is –11.0 to +15.0, in
0.5-hour units.
x For information about Flash Alert, see “Flash Alert” (page EN-37).
4. Press A to exit the setting screen.
x The day of the week is displayed automatically in accordance with the date (year,
month, and day) settings.
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
EN-13
3. When the setting you want to change is flashing, use D and B to change it as
described below.
Screen To do this: Do this:
Reset the seconds to
Press D.
Toggle between Daylight Saving Time
( ) and Standard Time ( )
Press D.
Specify the UTC offset
Use D (+) and B (–).
Change the hour or minutes
Use D (+) and B (–).
Change the year
Change the month or day
x See “Daylight Saving Time (DST)” on page EN-14 for details about DST setting.
EN-12
To set the time and date
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C to move the flashing in the sequence shown
below to select other settings.
Seconds DST UTC Offset
YearDayFlash Alert
CC
CC
C
Hour
Minutes
C
C
C
Month
C
UTC Offset
EN-11
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date.
Read This Before You Set the Time and Date !
The times displayed in the Timekeeping Mode and World
Time Mode are linked. Because of this, make sure you
select the UTC offset before you set the time and date.
Day of week
Hour : Minutes Seconds
PM indicator
Month – Day
EN-10
You can also find information about operational
procedures at the CASIO website.
https://s.casio.jp/mw/en/3585/
Operation Guide 3585
EN-29
Alarm Types
The alarm type is determined by the settings you make, as described below.
x Daily alarm
Set the hour and minutes for the alarm time. This type of setting causes the alarm to
sound everyday at the time you set.
x Date alarm
Set the month, day, hour and minutes for the alarm time. This type of setting causes
the alarm to sound at the specific time, on the specific date you set.
x 1-Month alarm
Set the month, hour and minutes for the alarm time. This type of setting causes the
alarm to sound everyday at the time you set, only during the month you set.
x Monthly alarm
Set the day, hour and minutes for the alarm time. This type of setting causes the
alarm to sound every month at the time you set, on the day you set.
EN-28
Alarms
You can set up to three independent multi-function alarms
with hour, minutes, month, and day. When an alarm is
turned on, the alarm tone sounds when the alarm time is
reached. One of the alarms is a snooze alarm.
You can also turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour.
x The snooze alarm screen is indicated by SNZ, while the
other alarm screens are numbered AL1 and AL2. The
Hourly Time Signal screen is indicated by SIG.
x All of the operations in this section are performed in
the Alarm Mode, which you enter by pressing C (page
EN-9).
Alarm number
Alarm date
(Month – Day)
Alarm time
(Hour : Minutes)
EN-27
To use the timer
Press D while in the Timer Mode to start the timer.
x The timer operation continues even if you exit the Timer
Mode.
x Press D while a countdown operation is in progress to
pause it. Press D again to resume the countdown.
x To stop a countdown operation completely, first pause
it (by pressing D), and then press A. This returns the
countdown time to its starting value.
EN-26
3. When the setting you want to change is flashing, use B and D to change it as
described below.
Setting Screen Button Operation
Hours, Minutes
Use D (+) and B (–) to change the setting.
Auto-repeat
Press D to toggle auto-repeat on ( displayed)
and off ( displayed).
Progress Beeper
Press D to toggle the progress beeper on ( ) and
off (
).
x To specify a countdown start time of 24 hours, set .
4. Press A to exit the setting screen.
x You can also perform steps 1 and 2 of the above procedure whenever you need to
view the current auto-repeat and progress beeper settings.
EN-25
To configure the timer
1. While the countdown start time is on the display in the
Timer Mode, hold down A until the current countdown
start time starts to flash, which indicates the setting
screen.
x If the countdown start time is not displayed, use the
procedure under “To use the timer” (page EN-27) to
display it.
2. Press C to move the flashing in the sequence shown
below to select other settings.
Hours Minutes
Auto-repeatProgress Beeper
C
C
C
C
EN-24
Countdown End Beeper
The countdown end beeper lets you know when the countdown reaches zero.
x When the progress beeper is turned off, the countdown end beeper sounds for
about 10 seconds, or until you press any button to stop it.
x When the progress beeper is turned on, the countdown end beeper sounds for
about one second.
Progress Beeper
When the progress beeper is turned on, the watch uses beeps to signal countdown
progress as described below.
x Starting from five minutes before the end of the countdown, the watch emits four
short beeps at the top of each countdown minute.
x 30 seconds before the end of the countdown, the watch emits four short beeps.
x The watch emits a short beep for each of the last 10 seconds of the countdown.
x If the countdown start time is six minutes or greater, the watch emits a short beep
for each second of the final 10 seconds before the five-minute point is reached.
Four short beeps are emitted to signal when the five-minute point is reached.
EN-23
Auto-repeat
When auto-repeat is turned on, the countdown restarts automatically from the
countdown start time when it reaches zero.
When auto-repeat is turned off, the countdown stops when it reaches zero and the
display shows the original countdown start time.
x Pressing D while an auto-repeat countdown is in progress pauses the current
countdown. You can resume the auto-repeat countdown by pressing D, or you
can press A to reset to the countdown time starting value.
Timer Beeper Operations
The watch beeps at various times during a countdown so you can keep informed
about the countdown status without looking at the display. The following describes
the types of beeper operations the watch performs during a countdown.
EN-22
Timer
The timer can be set within a range of one minute
to 24hours. An alarm sounds when the countdown
reaches zero. The timer also has an auto-repeat feature
and a progress beeper that signals the progress of the
countdown.
x All of the operations in this section are performed in
the Timer Mode, which you enter by pressing C (page
EN-9).
Configuring the Timer
The following are the settings you should configure before
actually using the timer.
Countdown start time; Auto-repeat on/off; Progress
beeper on/off
x See “To configure the timer” (page EN-25) for information
about setting up the timer.
SecondsHours
Minutes
EN-21
About Auto-Start
With Auto-Start, the watch performs a 5-second countdown, and stopwatch
operation starts automatically when the countdown reaches zero.
During the final three seconds of the countdown, a beeper sounds with each second.
To use Auto-Start
1. While the stopwatch screen is showing all zeros in the
Stopwatch Mode, press A.
x This displays a 5-second countdown screen.
x To return to the all zeros screen, press A again.
2. Press D to start the countdown.
x When the countdown reaches zero, a tone sounds and a
stopwatch timing operation starts automatically.
x Pressing D while the Auto-Start countdown is in
progress starts the stopwatch immediately.
EN-20
To measure times with the stopwatch
Elapsed time
D D D D A
Start Stop Resume Stop Clear
Split time
D A A D A
Start Split
(SPL displayed)
Split release Stop Clear
Two Finishes
D A D A A
Start Split
First runner
finishes.
Display time of
first runner.
Stop
Second runner
finishes.
Split release
Display time of
second runner.
Clear
Operation Guide 3585
EN-39
Button Operation Tone
The button operation tone sounds any time you press one of the watch’s buttons.
You can turn the button operation tone on or off as desired.
x Even if you turn off the button operation tone, the alarms, the Hourly Time Signal,
the countdown alarm, and stopwatch auto start all operate normally.
To turn the button operation tone on and off
In any mode (except when a setting screen is on the
display), hold down C to toggle the button operation tone
on (MUTE indicator not displayed) and off (MUTE indicator
displayed).
x Holding down C to turn the button operation tone on or
off also causes the watch’s current mode to change.
x The MUTE indicator is displayed in all modes when the
button operation tone is turned off.
MUTE indicator
EN-38
To turn Flash Alert on and off
1. In the Timekeeping Mode, hold down A for at least two
seconds until the current time flashes on the display.
This is the setting screen.
2. Press C eight times to display the Flash Alert setting
screen.
3. Press D to toggle Flash Alert on (
displayed) and
off (
displayed).
4. Press A to exit the setting screen.
x The Flash Alert setting you select with the above
procedure is applied in all modes.
x When Flash Alert is on,
appears on the
timekeeping screen for about one second whenever you
enter the Stopwatch, Timer, or Alarm Mode.
EN-37
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Flash Alert
When Flash Alert is turned on, the illumination flashes for the alarms, the Hourly Time
Signal, the countdown alarm, and stopwatch auto start.
EN-36
To illuminate the display
In any mode, press B to turn on illumination.
x You can use the procedure below to select either 1.5 seconds or 3 seconds as the
illumination duration. When you press B, the illumination will remain on for about
1.5 seconds or 3 seconds, depending on the current illumination duration setting.
To specify the illumination duration
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. While the seconds are flashing, press B to toggle the
setting between 1.5 seconds (
) and 3 seconds ( ).
3. Press A to exit the setting screen.
EN-35
Illumination
This watch has an LED light that causes the entire display
to glow for easy reading in the dark.
x See “Illumination Precautions” (page EN-42) for more
important information about using illumination.
EN-34
To turn the Hourly Time Signal on and off
1. In the Alarm Mode, use D to select the Hourly Time
Signal (SIG).
2. Press A to toggle it on and off.
x The Hourly Time Signal on indicator is shown on the
display in all modes while this function is turned on.
Hourly Time Signal on
indicator
EN-33
To turn an alarm on and off
1. In the Alarm Mode, use D to select an alarm.
2. Press A to toggle it on and off.
x Turning on a alarm (AL1 or AL2) displays the alarm on
indicator on its Alarm Mode screen.
x Turning on the snooze alarm (SNZ) displays the alarm
on indicator and snooze alarm indicator on the Alarm
Mode snooze alarm screen.
x In all modes, the alarm on indicator is shown for any
alarm that is currently turned on.
x The alarm on indicator flashes while the alarm is
sounding.
x The snooze alarm indicator flashes while the snooze
alarm is sounding and during the 5-minute intervals
between alarms.
Snooze alarm indicator
Alarm on indicator
EN-32
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 (page EN-33).
x Alarm and Hourly Time Signal operations are performed in accordance with the
Timekeeping Mode time.
x To stop the alarm tone after it starts to sound, press any button.
x Performing any one of the following operations during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen (page EN-12)
Displaying the SNZ setting screen (page EN-30)
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
EN-31
3. Press C to move the flashing in the sequence shown below to select other
settings.
CCCC
Hour Minutes Month Day
4. While a setting is flashing, use D and B to change it as described below.
Screen To do this: Do this:
Change the hour and
minutes
Use D (+) and B (–).
x With the 12-hour format, set the time correctly
as a.m. or p.m. (P indicator).
x To set an alarm that does not include a month
and/or day, set
for each setting.
Change the month and day
5. Press A to exit the setting screen.
EN-30
To set an alarm time
1. In the Alarm Mode, use D to scroll through the alarm
screens until the one whose time you want to set is
displayed.
D
AL1 AL2
D
D
SIG SNZ
D
x To set an alarm time, display the applicable alarm screen (AL1, AL2 or SNZ).
x The snooze alarm repeats every five minutes.
2. After you select an alarm, hold down A until the hour setting of the alarm time
starts to flash, which indicates the setting screen.
x This operation turns on the alarm automatically.
Operation Guide 3585
EN-44
Stopwatch
Measuring unit: 1/100 second
Measuring capacity: 23:59' 59.99"
Measuring modes: Elapsed time, split time, two finishes
Illumination: LED (light-emitting diode); Selectable illumination duration
Other: Button operation tone on/off, Flash Alert
Battery: One lithium battery (Type: CR2032)
Battery nominal voltage: 3V
Approximately 10 years on type CR2032 (Assuming 1.5 seconds of illumination per
day and 10 seconds of alarm operation per day)
Frequent use of the light shortens the battery life.
Specifications are subject to change without notice.
EN-43
Specifications
Accuracy at normal temperature:
±
30 seconds a month
Timekeeping: Hour, minutes, seconds, p.m. (P), month, day, day of the week
Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: UTC Offset; Daylight Saving Time (summer time)/Standard Time
World Time: 48 cities (29 time zones)
Other: Daylight Saving Time/Standard Time
Alarm
3 multi-function alarms (with 1 snooze alarm)
Setting units: month, day, hour, minute
Alarm beeper duration: 10 seconds
Timer
Measuring unit: 1 second
Input range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Other: Auto-repeat timing; Progress beeper
EN-42
x The letters “UTC” is the abbreviation for “Coordinated Universal Time”, which is the
world-wide scientific standard of timekeeping. It is based upon carefully maintained
atomic (cesium) clocks that keep time accurately to within microseconds. Leap
seconds are added or subtracted as necessary to keep UTC in sync with the
Earth’s rotation.
Illumination Precautions
x Illumination may be hard to see when viewed under direct sunlight.
x Illumination turns off automatically whenever an alarm sounds.
x Frequent use of illumination runs down the battery.
EN-41
Timekeeping
x Resetting the seconds to while the current count is in the range of 30 to 59
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to
without changing the minutes.
x The year can be set in the range of 2000 to 2099.
x The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to
change it except after you have the watch’s battery replaced.
World Time
All World Time Mode times are calculated from the current time in the Timekeeping
Mode using UTC offset values.
x The seconds count of the World Time is synchronized with the seconds count of
the Timekeeping Mode.
x The UTC offset is a value that indicates the time difference between a reference
point in Greenwich, England and the time zone where a city is located.
EN-40
Auto Return Features
x If you leave the watch in the Alarm Mode for two or three minutes without
performing any operation, it automatically changes to the Timekeeping Mode.
x If you leave a screen with flashing digits on the display for two or three minutes
without performing any operation, the watch automatically exits the setting screen.
Scrolling
The B and D buttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a
scroll operation scrolls at high speed.
Initial Screens
When you enter the World Time or Alarm Mode, the data you were viewing when you
last exited the mode appears first.
L-3
City
Code
City
UTC Offset/
GMT Differential
DXB Dubai +4
KBL Kabul +4.5
KHI Karachi
+5
MLE Male
DEL Delhi +5.5
DAC Dhaka +6
RGN Yangon +6.5
BKK Bangkok +7
SIN Singapore
+8HKG Hong Kong
BJS Beijing
SEL Seoul
+9
TYO Tokyo
ADL Adelaide +9.5
GUM Guam
+10
SYD Sydney
City
Code
City
UTC Offset/
GMT Differential
NOU
Noumea +11
WLG
Wellington +12
x This table shows the city codes of
this watch.
x The rules governing global times
(UTC offset and GMT differential) and
summer time are determined by each
individual country.
L-2
City
Code
City
UTC Offset/
GMT Differential
PPG Pago Pago –11
HNL Honolulu –10
ANC Anchorage –9
YVR Vancouver
–8SFO San Francisco
LAX Los Angeles
DEN Denver –7
MEX Mexico City
–6
CHI Chicago
MIA Miami
–5
NYC New York
CCS Caracas –4
YYT St John’s –3.5
RIO Rio De Janeiro –3
RAI Praia –1
City
Code
City
UTC Offset/
GMT Differential
LIS Lisbon
0
LON London
BCN Barcelona
+1
PAR Paris
MIL Milan
ROM Rome
BER Berlin
ATH
Athens
+2
JNB
Johannesburg
IST
Istanbul
CAI Cairo
JRS Jerusalem
MOW Moscow
+3
JED Jeddah
THR Tehran +3.5
City Code Table
L-1
City Code Table
