The India time zone is primarily used in aviation and military operations. In the opposite direction, going west from the meridian, the letters November through Yankee are used, and these time zones primarily have negative offsets. The letters Alpha through Mike – except for J – are used to label the 12 time zones east of the prime meridian with positive UTC offsets. The names use the NATO phonetic alphabet which calls for the 26 letters of the alphabet to be designated by easily recognizable words. The US Military, Chinese Military, and several others have adopted a unique list of names for the time zones across the world. This means that it is nine hours ahead of Coordinated Universal Time (UTC). There are no Daylight Saving Time clock changes.The India time zone (I) is the ninth zone to the east of the Greenwich or Prime Meridian, with an offset of UTC +9:00. 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. UTC +5:30 India Standard Time (IST) now 9 hours and 30 minutes ahead of New York The time in Delhi is 10 hours and 30 minutes ahead of the time in New York when New York is on standard time, and 9 hours and 30 minutes ahead of the time in New York when New York is on daylight saving time.
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
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