Time Zones in India India’s Time Zone History India had multiple time zones in the past In 1802, British astronomer John Goldingham at the East India Company established the time in Chennai as GMT+5:30 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
Time in India - Wikipedia The official time signal is given by the Time and Frequency Standards Laboratory in New Delhi The IANA time zone database mentions the zone pertaining to IST as Asia Kolkata, based on Kolkata, because it was the most populous city in the zone at the time the zone was set up Various time notations are used depending on the usage
Indian Standard Time - Wikipedia Indian Standard Time (IST), also known as India Standard Time, is the time zone observed throughout the Republic of India, with a time offset of UTC+05:30 India does not observe daylight saving time or other seasonal adjustments In military and aviation time, IST is designated E* ("Echo-Star") [1] It is indicated as Asia Kolkata in the IANA time zone database
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