Question

How India's standard time has been fixed?

Answer 1

India's standard time has been fixed with the longitudinal and latitudinal extent of centre of india by which it is passes.it is stable and same for all states of india.

or

Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time (DST) or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").

Indian Standard Time is calculated on the basis of 82.5' E longitude, in Mirzapur (Amravati Chauraha), Uttar Pradesh, which is nearly on the corresponding longitude reference line.

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Answer 2

Indian Standard Time is the time observed throughout india, with a time offset of utc .... Indian Standard Time is calculated on the basis of 82°5 E Longitude , in mirzapur in uttar pradesh which is nearly corresponding longitude