MO0410-EA
Operation Guide 2734 58 3748 9
About This Manual
• The operational procedures for Modules 2734, 2758,
3748, and 3749 are identical. All of the illustrations in
this manual show Modules 2734 and 2758.
• Button operations are indicated using the letters shown
in the illustration.
• 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.
Modules 2734 and 2758
Modules 3748 and 3749
General Guide
Alarm Mode
Date Alert Mode
• Press C to change from mode to mode.
• In any mode, press B to illuminate the display.
World Time Mode
Press C.
Timekeeping Mode
Stopwatch Mode
Time Recorder Mode
Hand Setting Mode
Radio-controlled Timekeeping
Important!
This watch receives a time calibration signal and update
its time setting accordingly. The time calibration signal
includes both Standard Time and Daylight Saving Time
(summer time) data.
Hour hand
Minute hand
• Position the watch as shown in the nearby illustration, with its 12 o’clock side facing
towards a window. Make sure there are no metal objects nearby.
• This watch is designed to pick up the time calibration
signal transmitted from Rugby, England and the signal
from Mainflingen, Germany.
Current Time Setting
This watch automatically adjusts its digital time setting in
accordance with a time calibration signal. You can also
perform a manual procedure to set the time and date,
when necessary.
Resin Band Metal Band
Day of week
Month – Day
• The first thing you should do after purchasing this watch
is to set your Home City, which is the city where you will
normally use the watch. For more information, see “To
set your Home City” below.
• When using the watch that is outside of the range of the transmitters in Rugby and
Mainflingen, you need to manually adjust the time as required. See “Timekeeping”
for information about manual settings.
• The watch should not be on its side or facing the wrong way.
• Proper signal reception can be difficult or even impossible under the conditions
listed below.
• The analog time of this watch is synchronized with the digital time. Because of this,
the analog time setting is automatically adjusted whenever you change the digital
setting. See “Analog Timekeeping” for more information.
To set your Home City
1. In the Timekeeping Mode, hold down A until the
transmitter indicator (A/T, MSF, or DCF) starts to
flash, which indicates the setting screen.
• If the displayed transmitter indicator shows
something other than A/T, use D to display A/T
before advancing to the next step.
Inside or
among
Inside a
vehicle
Near
household
Near a
construction
Near high-
tension
Among or
behind
buildings
appliances or site, airport, or power lines
mountains
office
other sources
of electrical
noise
equipment,
or a mobile
phone
2. Press C to display the city code setting screen.
3. Use D(east) and B(west) to select the city code you
want to use as your Home City.
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to five minutes, but in some cases
it can take as long as 12 minutes. Take care that you do not perform any button
operations or move the watch during this time.
City code
• The following are the city codes for major cities in the Western Europe time
zones.
LON: London
1,500 kilometers
PAR and BER: Paris, Berlin, Milan, Rome, Amsterdam, Hamburg, Frankfurt,
Vienna, Barcelona, Madrid
4. Press A twice to exit the setting screen.
• The first press of A displays the 12/24-hour setting screen. Pressing A again
exits the setting screen.
Rugby
Important!
500 kilometers
Mainflingen
• Normally, your watch should show the correct time as soon as you select your
Home City code. If it does not, it should adjust automatically after the next auto
receive operation (in the middle of the night). You can also perform manual receive
or you can set the time manually.
• This watch is designed to receive the time calibration signal transmitted from
Rugby, England and the signal from Mainflingen, Germany. Signal reception is
possible within the area represented by a circle with a radius of about 1,500
kilometers.
• If you are in an area that does not use Daylight Saving Time (summer time), turn off
the DST setting.
• See “Transmitters” for details about the transmitter indicator.
• At distances further than about 500 kilometers from a transmitter, signal reception
may not be possible during certain times of year or times of day. Radio interference
may also cause problems with reception.
• See the information under “Signal Receive Troubleshooting” if you experience
problems with time calibration signal reception.
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
• Auto Receive
With auto receive, the watch automatically picks up the time calibration signal five
times a day at 0:00 a.m., 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. For more
information, see “About Auto Receive”.
• Manual Receive
Manual receive lets you start a time calibration receive operation with the press of
a button. For more information, see “To perform manual receive”.
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Operation Guide 2734 58 3748 9
5. Press A to exit the setting screen.
To turn an alert on and off
• With the target alarm (TAL), the time starts to countdown as soon as you set the
1. In the Date Alert Mode, use D to select the screen for
the alert (DA1 through DA5) whose alert type you
want to select.
alarm time.
Countdown
(Seconds)
Countdown
(Hours : Minutes)
2. Press A to toggle it on and off.
• Note that the month and day do not appear if the alert
is turned off.
Alert On
2 seconds
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Press A.
L
Target Alarm Screen
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, or until you turn the alarm off.
The target alarm counts the time remaining from the current Home City time to the
target alarm time. Note that the target alarm repeats automatically each day, as long
as it is turned on.You need to turn off the target alarm to disable it.
• Pressing any button stops the alarm tone operation.
Alert Off
Time Recorder
The Time Recorder Mode lets you store up to 30 time
entries (month, day, hour, minutes) with the touch of a
button. One way you can use the Time Recorder Mode is
to record the start time and the end time of a particular
event.
• All of the operations in this section are performed in the
Time Recorder Mode, which you enter by pressing C.
Current time
(Hour : Minutes)
• 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
Displaying the snooze alarm setting screen
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
To record a Time Recorder time
1. Use C to enter the Time Recorder Mode.
• This displays the Time Recorder standby screen.
To turn an alarm on and off
Standby Screen
1. In the Alarm Mode, use D to select an alarm.
Alarm on indicator
2. Press A to toggle it on and off.
• Turning on a one-time alarm (AL1, AL2, AL3,
TAL) displays the alarm on indicator on its Alarm
Mode screen. Turning on the snooze alarm (SNZ)
displays the alarm on indicator and snooze alarm
indicator on its Alarm Mode screen.
2. Press D to record the current date and time (month, day, hour, minutes).
• The recorded time flashes for about two seconds and then assigned the next
available record number, in the range of T1 through T30. Next the time recorder
standby screen appears.
• A new time is recorded each time you press D while the standby screen is on the
display.
• Records are assigned numbers sequentially from T1 through T30.
• Storing a new time record when there are already 30 records stored in memory
automatically deletes record T1, shifts the remaining records upwards by 1, and
stores the new record as T30.
Snooze alarm
indicator
• In all modes, the alarm on indicator is shown for any
alarm that is currently turned on. When the snooze
Alarm on indicator
alarm is on, the snooze alarm indicator is displayed in
all modes.
• The alarm on indicator flashes while the alarm is
sounding.
• The snooze alarm indicator flashes during the 5-minute
To recall Time Recorder times
intervals between alarms.
1. In the Time Recorder Mode, press A to recall Time Recorder times.
• If there are no time recorder times currently in memory, the standby screen
remains on the display when you press A.
Snooze alarm
indicator
Modules 3748 and 3749
2. Use D to scroll through times stored in memory.
To turn the Hourly Time Signal on and off
Recorded time
(Hour : Minutes)
Recorded date (Month – Day)
1. In the Alarm Mode, use D to select the Hourly Time
Signal (
).
SIG
Alternate at two-second interval
2. Press A to toggle it on (the Hourly Time Signal on
indicator displayed) and off (the Hourly Time Signal on
indicator not displayed).
Time record number
• The Hourly Time Signal on indicator is displayed in all
modes when the Hourly Time Signal is turned on.
• Each press of D scrolls through time records from higher numbered (newer)
records to lower numbered records.
Hourly time signal
on indicator
• If you recorded a new Time Recorder time since you last entered the Time
Recorder Mode, the newest record appears first. If you have not recorded a new
time, the record you were viewing when you last exited the Time Recorder Mode
appears first.
• Press A to return to the standby screen.
To delete all Time Recorder times
Enter the Time Recorder Mode. While holding down A, press D to delete all Time
Recorder times.
Modules 3748 and 3749
Date Alert
Stopwatch
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.
The stopwatch lets you measure elapsed time, split
times, and two finishes.
Minutes
Seconds
• The display range of the stopwatch is 59 minutes, 59.99
seconds.
• The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
• Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
• The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
• All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing C.
Alert date
(Month–Day)
Current date
(Month–Day)
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1/100 second
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Date alert
indicator
Alert name
Date Alert Mode Screen
Timekeeping Mode Screen
(Current date does not flash if
digital time is displayed on the
Timekeeping Mode screen.)
To measure times with the stopwatch
Elapsed Time
D
Start
➤D
Stop
➤D
Re-start
➤
D
➤A
Clear
To set the alert date
Stop
1. Use C to enter the Date Alert Mode.
2. Use D to scroll through the alert screens until the one
whose date you want to set is displayed.
Split Time
A
A
➤D
Stop
➤
D
Start
➤A
Split
➤
Split release
Clear
DA1
DA2
DA3
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Two Finishes
DA5
DA4
A
D
➤A
Split release
➤
D
Start
➤A
Split
➤
Stop
Clear
3. After you select an alert, hold down A until the month setting of the alert date
starts to flash, which indicates the setting screen.
First runner
Second runner
finishes.
Display time of
second runner.
finishes.
• This operation automatically turns on the alert.
Display time of
first runner.
4. Press C to move the flashing between the month and day settings.
5. While the month or day setting is flashing, use D (+) and B (–) to change it.
6. Press A to exit the setting screen.
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Operation Guide 2734 58 3748 9
Timekeeping
Use the Timekeeping Mode to set and view the current time and date. This section
also explains how to manually set the current date and time.
• All of the operations in this section are performed in the Timekeeping Mode, which
you can enter by pressing C.
Analog Timekeeping
The analog time of this watch is synchronized with the digital time. The analog time
setting is adjusted automatically whenever you change the digital time.
Note
Month — Day
Hour: Minutes Seconds
Press A.
Month — Day
• The hands for the analog timepiece move to adjust to a new setting whenever any
A
of the following occurs.
When you change the digital time setting manually
When the digital time setting is changed by time calibration signal reception
When you change the Home City code and/or DST setting
• If the analog time does not match the digital time for any reason, use the procedure
described under “To adjust the analog time” to match the analog setting to the
digital setting.
Seconds
A
L
Day of week
• Whenever you need to adjust both the digital and the analog time settings
manually, make sure you adjust the digital setting first.
• Depending on how much the hands have to move in order to adjust to the digital
time, it may take some time before the analog hands stop moving.
Press D.
Last Signal Screen
Setting the Digital Time and Date Manually
Make sure you select your Home City code before you change the current time and
date settings. World Time Mode times are all displayed in accordance with the
Timekeeping Mode settings. Because of this, World Time Mode times will not be
correct if you do not select the proper Home City code before setting the time and
date in the Timekeeping Mode.
To adjust the analog time
1. In the Timekeeping Mode, press C six times to enter
the Hand Setting Mode.
2. Hold down A until the current digital time starts to
flash, which indicates the setting screen.
3. Use D (+) and B (–) to adjust the analog setting as
described below.
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To set the current digital time and date manually
1. In the Timekeeping Mode, hold down A until the
transmitter indicator starts to flash, which indicates the
setting screen.
Current time
2. Use A or C to move the flashing in the sequence
shown below to select other settings.
When you want to do this:
Move the hand setting
forward 20 seconds
Perform this button operation:
• Press D.
Press C.
/ Press A.
C
Transmitter/
City Settings
Auto
Receive
City Code
DST
Transmitter
Move the hand setting back
20 seconds
Move the hand setting a short
way forward at high speed
• Press B.
A
• Hold down D.
• Release D when the hands reach the setting
C
you want.
• Hold down B.
12/24-Hour
Format
Seconds
Month
Hour
Minutes
Year
Time/Date
Settings
Move the hand setting a
short way back at high speed
• Release B when the hands reach the setting
you want.
Day
Move the hand setting a
long way forward at high
speed
• While holding down D to move the hands at
high-speed, press B to lock the high-speed
hand movement.
3. When the setting you want to change is flashing, use B and/or D to change it as
described below.
• Press any button when the hands are close
Transmitter/City Settings
to the setting you want.
Screen:
To do this:
Do this:
• Hand movement stops automatically if the
hour hand makes one full (12-hour)
revolution.
Change the transmitter setting (A/T, Use D.
MSF, or DCF)
Change the city code
Use D (east) and B (west).
Move the hand setting a long • While holding down B to move the hands at
way back at high speed
high-speed, press D to lock the high-speed
hand movement.
Toggle between Daylight Saving
Time (ON) , Standard Time (OFF),
or Auto DST (A)
Press D.
DST
• Press any button when the hands are close
to the setting you want.
• Hand movement stops automatically if the
hour hand makes one full (12-hour)
revolution.
Toggle between auto receive on
(ON) and off (OF)
Press D.
• See “City Code Table” for a complete list of available city codes.
Time/Date Settings
4. Press A to exit the setting screen.
• The minute hand will be adjusted slightly to match the seconds when you exit the
setting screen.
Screen:
To do this:
Do this:
Press D.
Toggle between 12-hour (12H)
and 24-hour (24H) timekeeping
Reset the seconds to 00
• To return to the Timekeeping Mode, press C.
Press D.
Change the hour or minutes
Change the month, day, or year
Use D (+) and B (–).
Use D (+) and B (–).
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.
4. Use A to exit the setting screen.
• If a Transmitter/City Setting screen is displayed, press A twice.
• If a Time/Date Setting screen is displayed, press A once.
Auto return features
• When you exit the setting screen, the analog hands are adjusted automatically to
match the digital time. See “Analog Timekeeping” for more information.
• If you leave the watch in the Alarm (except for the target alarm screen explained
under “To set an alarm time”), Date Alert, or Hand Setting Mode for two or three
minutes without performing any operation, it automatically changes to the
Timekeeping Mode.
• If you leave the watch with a flashing setting or cursor on the display for two or
three minutes without performing any operation, it automatically saves any settings
you have made up to that point and exits the setting screen.
Note
• See “Transmitters” for more information.
• Auto DST (A) can be selected only while BER, PAR, LON, or ATH is selected as the
Home City code. For more information, see “Daylight Saving Time (DST)” below.
• The auto receive setting is used for time calibration signal reception only. See
“About Auto Receive” for details.
Scrolling
Daylight SavingTime (DST)
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 through the data at high speed.
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.
The time calibration signals transmitted from Rugby and Mainflingen include both
Standard Time and DST data. When the Auto DST setting is turned on, the watch
switches between Standard Time and DST (summer time) automatically in
accordance with the received time signal.
Initial Screens
When you enter the World Time, Alarm, or Date Alert Mode, the data you were
viewing when you last exited the mode appears first.
• The default DST setting is Auto DST (A) whenever you select BER, PAR, LON,
Radio-controlledTimekeeping Precautions
or ATH as your Home City code.
• Strong electrostatic charge can result in the wrong time being set.
• Even when the watch is within the reception range of the transmitter, signal
reception is impossible if the signal is blocked by mountains or other geological
formations between the watch and signal source.
• If you experience problems receiving the time calibration signal in your area, it is
probably best to switch between Standard Time and Daylight Saving Time (summer
time) manually.
To change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down A until transmitter indicator starts to flash,
which indicates the setting screen.
• Signal reception is affected by weather, atmospheric conditions, and seasonal
changes.
• The time calibration signal is bounced off the ionosphere. Because of this, such
factors as changes in the reflectivity of the ionosphere, as well as movement of the
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of
day may change the reception range of the signal and make reception temporarily
impossible.
2. Press C twice and the DST setting screen appears.
3. Use D to cycle through the DST settings in the sequence shown below.
• Even if the time calibration signal is received properly, certain conditions can
cause the time setting to be off by up to one second.
Auto DST(A
)
DST off(OFF)
DST on(ON)
4. When the setting you want is selected, press A twice to exit the setting screen.
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Operation Guide 2734 58 3748 9
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make.
• The watch is designed to automatically update the date and day of the week for the
period January 1, 2000 to December 31, 2039. Setting of the date by the time
calibration signal cannot be performed starting from January 1, 2040.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to
time data only.
• Normally, the signal reception date shown by the Last Signal screen is the date
data included in the received time calibration signal. When only time data is
received, however, the Last Signal screen shows date as kept in the Timekeeping
Mode at the time of signal reception.
• If you are in an area where proper time calibration signal reception is impossible,
the watch keeps time within 20 seconds a month at normal temperature.
• If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your transmitter, current city code,
DST (summer time), and auto receive settings. The following are the initial factory
defaults for these settings.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also
applied in all other modes.
• With the 12-hour format, the P (PM) indicator appears on the display for times in
the range of noon to 11:59 p.m. and no indicator appears for times in the range of
midnight to 11:59 a.m.
• With the 24-hour format, times are displayed in the range of 0:00 to 23:59. The
indicator 24 indicates the 24-hour format.
Backlight Precautions
The backlight uses an EL (electro-luminescent) panel for easy reading in the dark.
In any mode, press B to illuminate the display for about one second.
• The electro-luminescent panel that provides illumination loses power after very
long use.
• The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
• The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
• The backlight automatically turns off whenever an alarm sounds.
• Frequent use of the backlight shortens the battery life.
Setting
Transmitter
City code
Initial Factory Default
A/T
City Code Table
LON (London) (Module 2734 and 3749)
BER (Berlin) (Module 2758 and 3748)
City
Code
– – –
HNL
GMT
Differential
–11.0
City
Other major cities in same time zone
Pago Pago
Papeete
DST (summer time)
Auto receive
A
(Auto switching)
Honolulu
Anchorage
–10.0
DST
ON
ANC
–09.0
Nome
(Auto receive)
San Francisco, Las Vegas, Vancouver,
Seattle/Tacoma, Dawson City
El Paso, Edmonton
Houston, Dallas/Fort Worth,
New Orleans, Mexico City, Winnipeg
Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
La Paz, Santiago, Port Of Spain
Sao Paulo, Buenos Aires, Brasilia, Montevideo
LAX
DEN
CHI
Los Angeles
Denver
–08.0
–07.0
–06.0
R/C
Transmitters
Chicago
This watch is designed to receive the time calibration signal transmitted from Rugby,
England and the signal from Mainflingen, Germany. You can select either one of the
transmitters, or you can configure the watch to automatically select the transmitter
that has the strongest signal.
NYC
New York
–05.0
CCS
RIO
Caracas
Rio De Janeiro
–04.0
–03.0
–02.0
–01.0
– – –
– – –
GMT
LON
PAR
BER
ATH
CAI
JRS
JED
THR
DXB
KBL
KHI
• The following explains how the watch determines which transmitter it should check
first while the watch is configured for auto transmitter search (A/T).
Praia
Dublin, Lisbon, Casablanca, Dakar, Abidjan
+00.0
+01.0
London
Paris
Berlin
Athens
Cairo
Jerusalem
Jeddah
Tehran
Dubai
Kabul
Karachi
Delhi
Module 2734 and 3749
In this case:
The first signal auto search operation
after factory default settings are in effect, 2. If the Rugby signal cannot be received,
or after the city code has been changed
Any case other than the above.
Milan, Rome, Madrid, Amsterdam, Algiers, Hamburg,
Frankfurt, Vienna, Stockholm, Barcelona
Helsinki, Istanbul, Beirut, Damascus,
Cape Town
The watch does this:
1. Checks the Rugby signal first.
+02.0
+03.0
+03.5
+04.0
+04.5
+05.0
+05.5
+06.0
+06.5
+07.0
Kuwait, Riyadh, Aden, Addis Ababa, Nairobi, Moscow
checks the Mainflingen signal.
1. Checks the last successfully received
signal first.
2. If the last successfully received signal
cannot be received, checks the other
signal.
Shiraz
Abu Dhabi, Muscat
Male
DEL
DAC
RGN
BKK
Mumbai, Kolkata
Colombo
Dhaka
Yangon
Bangkok
Jakarta, Phnom Penh, Hanoi, Vientiane
Singapore, Kuala Lumpur, Beijing, Taipei, Manila, Perth,
Ulaanbaatar
Module 2758 and 3748
In this case:
HKG
Hong Kong
+08.0
The watch does this:
SEL
TYO
ADL
SYD
NOU
WLG
Seoul
Tokyo
Adelaide
Sydney
Noumea
Wellington
Pyongyang
+09.0
The first signal auto search operation
after factory default settings are in effect, 2. If the Mainflingen signal cannot be
or after the city code has been changed
Any case other than the above.
1. Checks the Mainflingen signal first.
+09.5
+10.0
+11.0
+12.0
Darwin
Melbourne, Guam, Rabaul
Port Vila
received, checks the Rugby signal.
1. Checks the last successfully received
signal first.
2. If the last successfully received signal
cannot be received, checks the other
signal.
Christchurch, Nadi, Nauru Island
• Based on data as of June 2004.
• Since the watch checks signals from both transmitters when A/T is selected as
the transmitter setting, the signal receive operation can take as long as 12 minutes.
• To find out the module number of your watch, look at its
2734
2758
back cover. The Module number (2734, 2758, 3748, or
3749) will be engraved inside the box on the back
cover.
To select a transmitter
1. In the Timekeeping Mode, hold down A until the
transmitter indicator starts to flash, which indicates the
setting screen.
2. Use D to scroll through available transmitter settings
until the one you want to select is displayed.
To set up the watch to do this:
Select this transmitter setting:
Automatically select the Rugby or Mainflingen signal
Receive the Mainflingen signal
Receive the Rugby signal
A/T
DCF
MSF
• Note that --- appears in place of the transmitter indicator when any city code
besides LON, PAR, BER, or ATH is selected as the Home City code. This
indicates that you cannot specify a transmitter.
3.Press A twice to exit the setting screen.
Timekeeping
• Resetting the seconds to 00 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 00 without changing the minutes.
• The day of the week is automatically displayed in accordance with the date (year,
month, and day) settings.
• The year can be set in the range of 2000 to 2039.
• 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.
• The current time for all city codes in the Timekeeping Mode and World Time Mode
is calculated in accordance with the Greenwich Mean Time (GMT) differential for
each city, based on your Home City time setting.
• GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC*) data.
* The letters “UTC” stands for “Universal Time Coordinated,” 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. The reference point for UTC is
Greenwich, England.
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