Seiko 9S519S559S56 manual Time difference adjustment, 〈How to calculate the time differences〉

<Time difference adjustment>

Time difference adjustment enables you to adjust the hour hand only in one-hour increments by easy operation without stopping the minute and second hands. It is convenient when adjusting the time based on a different time zone while you travel abroad.

■How to determine the time differences between two areas

●Before making the time difference adjustment, it is necessary to obtain the time differences between the two areas.

〈How to calculate the time differences〉

Assuming that you move from time zone "A" to time zone "B" and that the time difference from GMT for the two time zones are "a" and "b", respectively, the time difference between them can

16be obtained from the following formula:〔b〕―〔a〕

〈Example：If you move from Japan to New York〉

Time difference from GMT for Japan, time zone A:〔a〕＝＋9

Time difference from GMT for New York, time zone B:〔b〕＝－5

○Time difference between the two cities is:

〔b〕―〔a〕＝（－5）－（＋9）＝（－14）hours

※Time difference from GMT is shown in P.18.

※If daylight saving time is in effect in an area, there will be a one hour to the time difference from GMT.