Indian Standard Time
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Indian Standard Time (IST) is the time observed in India. Its time offset is at all times of the year.
Indian Standard Time is calculated at the Allahabad observatory. Allahabad is 82.5 °E of the Prime Meridian and as a result the time difference between Greenwich and Allahabad is exactly 5 hours and 30 minutes.
The entire country shares the same time zone. As a result sunrise and sunset times are substantially different across the breadth of the country. Another temporal inconsistency occurs because parts of India lie east of Bangladesh which observes UTC+6 as the standard time. Thus, moving from, say, Assam to West Bengal (both in India) in the same direction implies moving clocks forward and backward by half an hour as one passes over Bangladesh.
India's time zones were established in 1884, when there were two standard time zones, Bombay Time and Calcutta Time. The IST came into effect in 1905. However, Bombay still persisted with its own time zone, 39 minutes behind IST, until 1955.
Currently India does not observe daylight saving time, though it was used during the Sino-Indian War (1962), the Indo-Pakistani War of 1965 and the Indo-Pakistani War of 1971.
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