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all people, of the world will be working in the same time 
this will lead to substantial development and also lead to unity among nations
this affects the sleep wake cycle of many people which makes it almost practically impossible 
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It makes easy for whole country as the same time is followed throughout it.
but in vast nations like usa, russia etc , it is highly impossible as the time difference may be more than a quarter day.
standard time must be followed by all the nations though local times differ 
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