Seiko 7B24 - Page 29

109
TimeZoneAdjustmentFunction
※ Timedi󱐯erencesbetweenregionsanddaylightsavingtimemaychangeduetocircumstancesofacountryorregion.
※ Atimedi󱐯erenceestablishedin15minuteor30minuteunitsisadoptedinverylimitedregions(ex.India).
Therearetimedi󱐯erencesaroundtheworldbasedon“CoordinatedUniversal
Time(UTC).”Thereare24regions(TimeZones)aroundtheworldwitha
timedifferenceofonehour.Thissystemhasbeenadoptedinternationallyby
settingthetotaltimedi󱐯erencearoundtheworldas24hours.
Inaddition,DaylightSavingTime(SummerTime)isindividuallyadoptedin
some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.Daylightsavingtimehas
beenadoptedinabout80countries,mainlyinEuropeandNorthAmerica.The
adoptionanddurationofdaylightsavingtimevarydependingonthecountry.