India Time

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In India, Indian Standard Time (IST) is calculated from the clock tower in Mirzapur within 4 angular minutes of the reference longitude of IST at 82°30'E. It was in 1905 that the meridian passing east of Allahabad was declared a standard time zone for British India, and in 1947 it was renamed IST for the Dominion of India. Naini near Allahabad, at 82°5'E, was chosen as the standard meridian for the entire country because there is a difference in time between western India (around +05:00) and northeastern India (around +06:00), therefore roughly standardizing with UTC+05:30 of central India. Indian Standard Time (IST) is currently maintained by the Council of Scientific and Industrial Research-National Physical Laboratory (CSIR-NPL) with the help of the Allahabad Observatory.