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Time zone is different throughout the world, but is it really different? Currently, it's 4:45 in Korea, 12:45 in Germany, and rest of countries you never heard of its name before would be XX: 45 now. Time zone was set based on the Greenwich Mean Time (GMT), so basically an hour is different yet, minutes and seconds are equal. A watch inform us the different time zones of various countries at the same time by using this fact.
Whenever someone looks at the watch, they would feel the time of region intuitively other than the country they reside.
00, South Korea
Seoul, South Korea