Casio 4304, 4305 Reference, Time Zone Table, Daylight Saving Time (DST), Auto Return Features, Button Operation Timing, Scrolling, Radio-controlledTimekeeping Precautions

Operation Guide 4304 4305

3.Select the setting you want to change, and then use Ato change it as shown below.

Screen	To do this:						Do this:
	Cycle through time zones						Press A.
	Toggle between Daylight Saving Time (				), Standard		Press A.
	Time (	), or Auto DST (	)
	Reset the seconds to						Press A.
	Change the hour						Press A.
	Change the minutes						Press A.
	Change the year						Press A.
	Change the month						Press A.
	Change the day						Press A.
	Cycle through day of the week languages						Press A.
		: English
		: Spanish
		: French
		: German
		: Italian
	Toggle signal auto receive on (			) and off (		)	Press A.

(This setting is possible only for time zones that support time calibration signal reception.)

•When setting the day, the watch automatically will skip days (30 and 31) that are not included in the currently selected month. If you can’t select 30 or 31 when you want to, check to make sure that the proper month is selected.

4.Press Bto exit the setting mode.

•This will cause the hands to move to the current time, and resume normal movement.

Note

•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.

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.

The time calibration signals transmitted from Mainflingen (Germany), Rugby (England), or Fort Collins (the United States) 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 signals.

•The time calibration signals transmitted from Fukushima and Fukuoka/Saga (Japan) do not include summer time data.

•The default DST setting is Auto DST (At) whenever you select 0, +1, +2, E (GMT –5), C (GMT–6), M (GMT–7), or P (GMT–8) as your Home City code.

•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 Buntil the currently selected Time Zone appears on the display. This is the setting mode.

2.Press Band the DST setting screen appears.

3.Use Ato cycle through the DST settings in the sequence shown below.

Auto DST (At) DST on (On) DST off (OF)

4.When the setting you want is selected, press B nine times to exit the setting screen.

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.

Auto Return Features

•If you leave the watch in the Home Position Adjustment Mode for about three minutes without performing any operation, it returns to the Timekeeping Mode automatically.

•If you do not perform any operation for about three minutes while a setting mode is selected, the watch will exit the setting mode automatically.

Button Operation Timing

This watch is designed so the function of a button is executed when you release the button, not when you press it.

Scrolling

•The A button is used to change the hand setting in various setting modes. In most cases, holding down the A button will start high-speed movement of the applicable hand(s).

•High-speed movement of the hands will continue until it completes a 12-hour cycle, or until you press Abutton to stop it.

Radio-controlled Timekeeping Precautions

•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 will be impossible if the signal is blocked by mountains or other geological formations between the watch and signal source.

•Signal reception is affected by weather, atmospheric conditions, and seasonal changes.

•The time calibration signal bounces 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.

•Even if the time calibration signal is received properly, certain conditions can cause the time setting to be off by up to one second.

•The current time setting in accordance with the time calibration signal takes priority over any time settings you make manually.

•The watch is designed to update the date and day of the week automatically for the period January 1, 2001 to December 31, 2098. Setting of the date by the time calibration signal cannot be performed starting from January 1, 2099.

•This watch can receive signals that differentiate between leap years and non-leap years.

•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 Home Time Zone (GMT differential) setting.

The following are the initial factory defaults for this setting. Module 4304: GMT +1.0

Module 4305: GMT 0.0

•To find out the module number of your watch, look at its

4304	back cover. The Module number (4304 or 4305) is
	engraved inside the box on the back cover.

Transmitters

The time calibration signal received by this watch depends on the currently selected home time zone.

•When a U.S. time zone is selected, the watch receives the time calibration signal transmitted from the United States (Fort Collins).

•When a Japanese time zone is selected, the watch receives the time calibration signal transmitted from the Japan (Fukushima and Fukuoka/Saga).

•When a European time zone is selected, the watch receives the time calibration signals transmitted from Germany (Mainflingen) and England (Rugby).

The following tables show the reception priority for the European signals.

Module 4304

In this case:	The watch does this:
The first signal search operation after	1. Checks the Mainflingen signal first.
factory default settings are in effect.	2. If the Mainflingen signal cannot be
	received, checks the Rugby signal.
The first signal search operation after	1. Checks the Rugby signal first.
the Home Time Zone has been	2. If the Rugby signal cannot be received,
changed.	checks the Mainflingen signal.
Module 4305
In this case:	The watch does this:
The first signal search operation after	1. Checks the Rugby signal first.
factory default settings are in effect.	2. If the Rugby signal cannot be received,
	checks the Mainflingen signal.
The first signal search operation after	1. Checks the Rugby signal first.
the Home Time Zone has been	2. If the Rugby signal cannot be received,
changed.	checks the Mainflingen signal.

Timekeeping

•The year can be set in the range of 2001 to 2098.

•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 time zones in the Timekeeping Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential of each zone, based on your Home Time Zone time setting.

•GMT differential is calculated by this watch based on Universal Time Coordinated (UTC*) data.

*UTC 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.

Time Zone Table

Display	GMT	Major cities in same time zone
Indicator *1	Differential	(Letters in parentheses are city codes.*1)
	–11.0	Pago Pago (PPG)
	–10.0	Honolulu (HNL), Papeete
	–09.0	Anchorage (ANC), Nome
	–08.0	Los Angeles (LAX), San Francisco, Las Vegas, Vancouver,
		Seattle/Tacoma, Dawson City
	–07.0	Denver (DEN), El Paso, Edmonton
	–06.0	Chicago (CHI), Houston, Dallas/Fort Worth,
		New Orleans, Mexico City, Winnipeg
	–05.0	New York (NYC), Montreal, Detroit, Miami, Boston,
		Panama City, Havana, Lima, Bogota
	–04.0	Caracas (CCS), La Paz, Santiago, Port Of Spain
	–03.0	Rio De Janeiro (RIO), Sao Paulo, Buenos Aires, Brasilia, Montevideo
	–02.0
	–01.0	Praia (RAI)
	+00.0	London (LON), Dublin, Lisbon, Casablanca, Dakar, Abidjan
	+01.0	Paris (PAR), Milan, Rome, Madrid, Amsterdam, Algiers, Hamburg,
		Berlin (BER), Frankfurt, Vienna, Stockholm
	+02.0	Cairo (CAI), Jerusalem (JRS), Helsinki, Istanbul, Beirut, Damascus,
		Cape Town, Athens
	+03.0	Jeddah (JED), Kuwait, Riyadh, Aden, Addis Ababa, Nairobi, Moscow
	+04.0	Dubai (DXB), Abu Dhabi, Muscat
	+05.0	Karachi (KHI), Male
	+06.0	Dhaka (DAC), Colombo
	+07.0	Bangkok (BKK), Jakarta, Phnom Penh, Hanoi, Vientiane
	+08.0	Hong Kong (HKG), Singapore, Kuala Lumpur, Beijing, Taipei, Manila,
		Perth, Ulaanbaatar
	+09.0	Tokyo (TYO), Seoul, Pyongyang
	+10.0	Sydney (SYD), Melbourne, Guam, Rabaul
	+11.0	Noumea (NOU), Port Vila
	+12.0	Wellington (WLG), Christchurch, Nadi, Nauru Island

•Based on data as of December 2004.

*1 Display indicators and city codes are marked on the back cover of the watch.

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