In science we use SI units so as to reduce confusion and errors in the same manner a standard time in any country be it India or any other country helps in precision and standardization.
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If there is n standard time in india then each and every place of india will have different time so there will be a lot of confusion of what the time is?,for ex:: time gap between Arunachal pradesh and Gujarat is 2 hours if these states have their own local time which is different from the others then the time will be different at any if there is no standard time it leads to lot of confusion of what the time is at an we have introduced the standard time to solve this problem.if a nation has a standard time then the time will be same at any place and there wont be any confusion.

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hope this helps u.
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