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24 TIME ZONES AND TIME DIFFERENCES FROM UTC
Date line
JAPAN(JJY)
THE UNITED
STATES (WWVB)
EUROPE
(DCF77 from Germany)
EUROPE
(DCF77 from Germany)
WHAT IS A TIME ZONE?
TIME ZONE AND TIME DIFFERENCE
Time zone means the region where the common standard time is used. There are 24 time zones
around the world based on time differences from UTC (Universal Coordinated Time). In some
regions daylight saving time (DST) is adopted.
[What is UTC (Universal Coordinated 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.