Question

what is Indian standard time why do we need a standard time for India

Answer 1

There is a time lag of almost two hours between Gujarat in the West and Arunachal Pradesh in the East. Hence, time along the Standard Meridian of India (82°30' E) passing through Mirzapur (in Uttar Pradesh) is taken as the standard time for the whole country. For convenience, there is one standard time followed, Indian Standard Time (IST), which is the time along the Standard Meridian of India at 82°30' E, five-and-a-half hours ahead of Greenwich Mean Time.