![]() India observes India Standard Time all year. ![]() This time zone was declared India Standard Time (IST) in 1947, though Calcutta Time was used until 1948 and Bombay Time until 1955. Eventually, in 1905, the meridian near Mirzapur (82☃3’E) was picked as the standard time for the whole country. In 1884 two time zones were used in India: Calcutta Time (UTC+5:53:28) and Bombay Time (UTC+4:51:20)-just over an hour apart. In 1802, British astronomer John Goldingham at the East India Company established time in Chennai as GMT+5:30. India had multiple time zones in the past. The implementation has yet to be legally formalized. In 2018, the CSIR-National Physical Laboratory (CSIR-NPL) and the National Measurement Institute (NMI) of India proposed implementing two time zones in India: IST-I (UTC+5:30) and IST-II (UTC+6:30) in the northeast. But for now, it seems like the drawbacks of one time zone do not outweigh the benefits of two. As seen from the tea gardens, early sunrise causes loss of sleep and productivity in locations with less daylight hours, and early sunset can lead to higher energy consumption. There are a few drawbacks of keeping the one time zone. Tea Garden Time, translated as “Chai Bagan Time,” was introduced by the British tea companies to increase daylight work hours and thus productivity and is still in use today. In this part of the country, sunrise can come as early as 4:00 (4 am) IST in the morning and sunset at 16:00 (4 pm) IST in the afternoon. There the clocks are unofficially set one hour ahead of IST (UTC+6:30). Tea Garden Time is an informal time zone used in India's northeastern state Assam. If the country were to base its time zones on mean solar time, it would have three time zones, but since it only has one, the Sun rises almost 90 minutes earlier in Dong in the far east than in Guar Mota in the west. It spans nearly 30 degrees longitude (68☇'E to 97☂5'E). India is a large country that stretches almost 3000 kilometers (1864 miles) from west to east. However, the UTC+5:30 offset has been used as the local standard time in India since 1906. The country has officially observed India Standard Time (IST) since 1947. Time Zone Currently Being Used in India Offset Business Date to Date (exclude holidays).In a few regions, however, the legal time kept is not that of one of the 24 standard time zones because half-hour or quarter-hour differences are in effect there. Time is the same throughout each zone and differs from the international basis of legal and scientific time, Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC), by an integral number of hours minutes and seconds are the same. These meridians are theoretically the centres of 24 standard time zones in practice, the zones have in many cases been subdivided or altered in shape for the convenience of inhabitants. The present system employs 24 standard meridians of longitude (lines running from the North Pole to the South, at right angles to the Equator) 15º apart, starting with the prime meridian through Greenwich, England. Following this initiative, in 1884 delegates from 27 nations met in Washington, D.C., for the MeridianĬonference and agreed on a system basically the same as that now in use. Sir Sandford Fleming, a Canadian railway planner and engineer, outlined a plan for worldwide standard time in the late 1870s. The need for a standard time was felt most particularly in the United States and Canada, where several extensive railway routes passed through places that differed by several hours in local time. Some such standard became increasingly necessary with the development of rapid railway systems and the consequent confusion of schedules that used scores of different local times kept in separate communities (local time varies continuously with change in longitude). The concept of standard time was adopted in the late 19th century in an attempt to end the confusion that was caused by each community's use of its own solar time. The whole of China, one of the largest countries in the world, has decided to adopt a single time zone. Standard time the time of a town, region or country that is established by law or
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