Question

What is indian standard time ? Why do we need this time ?

Answer 1

India is a very big country. In order to maintain the uniformity of time within the country the Standard Meridian of India is taken as 82 ½ ° E longitude. It passes through the city of Allahabad. The local time along this Meridian serves as the Indian Standard Time (I.S.T) . The local time of Mirzapur near Allahabad is taken as the standard time all over India . I.S.T is 5:30 hours ahead of G.M.T (Greenwich Mean Time) located in London.
Standard Meridian of India is needed to maintain time uniformity in India. 82 ½ ° has been selected as the Standard Meridian of India due to the following reasons :
1. This is a central Meridian of India as it divides the country into two equal parts. 2.This Central Meridian helps India to adopt time uniformity.

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Answer 2

IST is the standard time that's applicable all over the country and is same. It's there to provide uniformity and avoid confusion.

We need a standard meridian(82°30'E in India) for the entire country to have a uniform time.