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Yes earth has 24 different times of zone

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this is not entirely correct ..
kkk thanks for saying entirely

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24 standard time zones    and  40  world time zones.

The Earth has been divided into 24 standard time zones.  1 zone for each hour and for 360/24 = 15 deg. longitude. 

In many standard time zones, some countries have adopted a different UTC for them.  So additionally there are 16 time zones.  So there are totally 40 time zones observed, like  IST.

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