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India uses only one time zone (even though it spans two geographical time zones) across the whole nation and all its territories, called Indian Standard Time (IST), which equates to UTC+05:30, i.e. five and a half hours ahead of Coordinated Universal Time (UTC). India does not currently observe daylight saving time (DST or summer time).
It was then decided that India would have two time zones, Calcutta (now Kolkata), and Bombay (now Mumbai). Bombay Time was set at 4 hours and 51 minutes ahead of Greenwich Mean Time (GMT). [1] [2] However, Bombay Time was difficult to convert to Indian Standard Time (IST) after it was adopted on 1 January 1906 as the official time zone of India.
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
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), [2] 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 1948 and 1955, respectively. [3]
Data from 1971 to 1991–92 are based on official exchange rates. Data from 1992 to 1993 onward are based on FEDAI (Foreign Exchange Dealers' Association of India) indicative rates. Data from 1971 to 1972–73 for the Deutsche Mark and the Japanese Yen are cross rates with the US Dollar. The Euro replaced the Deutsche Mark w.e.f. January 1, 1999.
But two expanded forms are used in India. The DD MMMM YYYY usage (e.g. 21 October 2022) is more prevalent over the MMMM DD, YYYY (e.g. October 21, 2022) usage except the latter is more used by media publications, such as the print version of the Times of India [4] and The Hindu. [5]
≡ Time of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at 0 K [8] (but other seconds are sometimes used in astronomy). Also that time it takes for light to travel a distance of 299 792 458 metres. (SI base unit) shake: ≡ 10 −8 s = 10 ns ...
India does not observe daylight saving time (DST) or other seasonal adjustments, although DST was used briefly during the Sino–Indian War of 1962, and the Indo–Pakistani Wars of 1965 and 1971. In certain time-zone maps, IST is designated as E*. Indian Standard Time is calculated on the basis of 82.5 °E longitude which just west of the town ...