Manual Seiko 1B25 (page 11 of 22) (English)

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■Q&Afortheworldtimefunction

Ｑ：WhenreturningtoJapanfromoverseas,isthetimeautomaticallysettoJapantime?

Ａ：

JustmovingcannotadjusttheJapaneselocaltime.Afterselectingthetimezone,radiosignalreceptionisnot

performed.WhenwearingawatchinJapan,settoJapantimebyuseofthetimezoneadjustmentfunction.

Ｑ：

WillthewatchbeautomaticallysettothelocaltimewhenitismovedtoaplaceoutsideJapaninadiﬀerenttimezone?

Ａ：



ThewatchwillnotbeautomaticallysettothelocaltimeifitisjustmovedtoaplaceoutsideJapaninadiﬀerenttimezone.

Whentravelingoutsideofyourhometimezone,selectthetimezoneorsetthetimediﬀerenceofyourcurrentlocation.

 

Byselectingthetimezoneorbysettingthetimediﬀerenceofyourcurrentlocation,thewatch

automaticallydisplaysthelocaltimeofyourcurrentlocation.

 (Thetimediﬀerencecanbesetinone-hourincrements.)



Afterthetimezoneisselectedorthetimediﬀerenceisset,thewatchcandisplaytheprecisetimebyreceiving

radiosignals,providedthatthewatchiswithintheradiosignalreceptionrange.

 （Theradiosignaltransmittingstationcanbechangedbyselectingatimezone.）

Ｑ：

Duringoperationoftimezoneselectionortimediﬀerencesetting,thehandsofthewatchdonotmove.Doesthiscausethewatchtodisplaythewrongtime?

Ａ：Theinternalcircuitstoresthetime,therefore,notimelagoccurs.

Ｑ：

Whenthetimezoneortimediﬀerenceissettoaregionoutsidetheradiosignalreceptionrange,

thewatchcannotreceiveradiosignals.Howdoesthisaﬀecttheaccuracyofthewatch?

Ａ：

Thewatchhasanaccuracyofanormalquartzwatchinthatcase.(Monthlyrate:±15 seconds)

Ｑ：

HowcanIsetthewatchtodisplaythelocaltimeinaregionwith15-minuteor30-minuteoﬀsetsfromUTC?

Ａ：

Thetimecanbeadjustedona1hourbasisbyuseofthetimediﬀerenceadjustmentfunction.



Whenadjustingtoalocaltimewithatimediﬀerenceof15minutesor30minutes.

→HowtomanuallysetthetimeP.151

WorldTimeFunction

129

■Whatisatimezone?

BasedonCoordinated UniversalTime (UTC),the standardtime commonlyusedis

adoptedby countriesand regionsaround theworld.Thestandardtimeisdetermined

byeachcountry orregion,and theregion wherethesamestandardtimeisadoptedis

referredtoasthetimezone.Further,DaylightSavingTime(DST)isindividuallyadopted

incountriesandregions.

[WhatisUTC(CoordinatedUniversalTime)?]

 UTCistheuniversalstandardtimecoordinatedthroughinternationalagreement.Itis

usedastheoﬃcialtimearoundtheworld.UTCisdeterminedbyaddingaleapsecondto

GMT(GreenwichMeanTime),whichisdeterminedthroughastronomicalmeasurement,in

ordertokeeptheprecisetime.

[Whatissummertime(DST)?]

 

Summertimeisdaylightsavingtime.Advancingthewatchonehourtoprolongdaytime

duringlongerdaylighthoursinsummer.TheadoptionanddurationofDaylightSaving

Time(DST)varydependingonthecountry.

※

Timediﬀerencesbetweenregionsanddaylightsavingtimemaychangeduetocircumstancesofacountryorregion.

※ 

Insomeregions,timezonesthatdiﬀerfromUTCbyhalf-orquarter-hourtimediﬀerencesareestablished.(Forexample,somepartsofIndia.)

WorldTimeFunction

128

※ Thetimezonesandtimediﬀerenceswitha△markinthereceivableradiosignalscolumnsshouldbe

selectedwhentheDaylightSavingTime(DST)isbeingobservedinTokyo,NewYorkorParis/Berlin.

※ Eachindicationmaydiﬀerdependingonthemodel(design)ofthewatch.

(AsofMarch2015)

TimeZone

Index

TimeDiﬀerence

Index

Secondhand

positions

Namesofrepresentative

cities(TimeZone)

Timediﬀerence

fromUTC

Receivable

radiosignals

WLG 12

30-secondposition

Wellington

+12hours

−

TBU 13

32-secondposition

Nuku'alofa

+13hours

−

MDY − 11

34-secondposition

MidwayIslands

−11hours

−

HNL − 10

36-secondposition

Honolulu

−10hours

−

ANC − 9

38-secondposition

Anchorage −9hours −

LAX − 8

41-secondposition

LosAngels −8hours WWVB

DEN − 7

43-secondposition

Denver −7hours WWVB

CHI − 6

45-secondposition

Chicago −6hours WWVB

NYC − 5

48-secondposition

NewYork −5hours WWVB

SDQ − 4

50-secondposition

SantoDomingo −4hour WWVB△

RIO − 3

53-secondposition

RiodeJaneiro −3hours −

FEN − 2

55-secondposition

FernandodeNoronha

−2hours −

PDL − 1

57-secondposition

Azores −1hour −

WorldTimeFunction

127

Timezonedisplayandtimediﬀerencetable

Inthetimezoneadjustmentmodeortimediﬀerencesettingmode,setthesecondhandtopointatthetimezoneindexortime

diﬀerenceindexofthetargetareareferringtothetablebelow.

TosettheDaylightSavingTime(DST),setthesecondhandtopointatthetimezoneindexortimediﬀerence

indexnexttothetargetareaintheclockwisedirection(+1hour).

TimeZone

Index

TimeDiﬀerence

Index

Secondhand

positions

Namesofrepresentative

cities(TimeZone)

Timediﬀerence

fromUTC

Receivable

radiosignals

LON UTC

0-secondposition

London

0hours

DCF77

PAR/BER

3-secondposition

Paris/Berlin

+1hours

DCF77

CAI 2

6-secondposition

Cairo

+2hours

DCF77△

JED 3

8-secondposition

Jeddah

+3hours

−

DXB 4

11-secondposition

Dubai

+4hours

−

KHI 5

13-secondposition

Karachi

+5hours

−

DAC 6

15-secondposition

Dhaka

+6hours

−

BKK 7

18-secondposition

Bangkok

+7hours

−

BJS/HKG

21-secondposition

Beijing/Hongkong

+8hours

BPC

TYO 9

23-secondposition

Tokyo

+9hour

JJY

SYD 10

25-secondposition

Sydney

+10hours

JJY△

NOU 11

28-secondposition

Nouméa

+11hours

−

WorldTimeFunction

126

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Seiko 1B25 Manual

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