In 2001, the government established a four-member committee under the Ministry of Science and Technology to examine the need for multiple time zones and daylight saving. The binary system that they suggested involved a return to British-era time zones, but the recommendations were not adopted. In the late 1980s, a team of researchers proposed separating the country into two or three time zones to conserve energy. Inhabitants of the northeastern states have to advance their clocks with the early sunrise to avoid the extra consumption of energy after daylight hours. The country's east–west distance of more than 2,933 kilometres (1,822 mi) covers over 29° of longitude, resulting in the sun rising and setting almost two hours earlier on India's eastern border than in the Rann of Kutch in the far west. Currently, the Council of Scientific and Industrial Research- National Physical Laboratory (CSIR-NPL) maintains the Indian Standard Time with the help of the Allahabad Observatory. This longitude of 82☃0'E was chosen as the standard meridian for the whole country as it is located centrally between western India ( local time UTC +05:00) and northeastern India ( local time UTC +06:00). In 1905, the meridian passing east of Allahabad was declared as a standard time zone for British India and was declared as IST in 1947 for the Dominion of India. Indian Standard Time is calculated from the reference longitude of IST at 82☃0'E passing near Mirzapur. Former timezones Time ZoneĬalculation Location of Mirzapur (near Allahabad) and the 82☃0’ E longitude that is used as the reference longitude for IST ĭaylight Saving Time (DST) was used briefly during the China–India War of 1962 and the Indo-Pakistani Wars of 19. The Central observatory was moved from Madras to a location at Shankargarh Fort in Allahabad district, so that it would be as close to UTC+05:30 as possible. The Indian Standard Time was adopted on 1 January 1906 during the British era with the phasing out of its precursor Madras Time (Railway Time), and after Independence in 1947, the Union government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 19, respectively.
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