Calcutta time was one of the two time zones established in British India in 1884. It was established during the International Meridian Conference held at Washington, D.C in the United States. It had decided that India has two time zones, which it has providing Calcutta (now Kolkata) would use the 90th meridian east and Bombay (Mumbai) the 75th meridian east.
Calcutta Time was described as being twenty-four minutes faster than Indian standard time and one hour and three minutes faster than Bombay standard time. (UTC+5:54) It has also been described as 32 minutes and 20 seconds faster than Madras time. (UTC+5:53:20) Even when Indian Standard Time (IST) was adopted on January 1, 1906, Calcutta time remained in effect until 1948 when Calcutta time was abandoned in favour of IST.
In the latter part of the nineteenth century, Calcutta time was the dominant time of the Indian part of the British empire with records of astronomical and geological events recorded in this time. Willian Strachey, an uncle of Lytton Strachey was said to have visited Calcutta once and then "kept his own watch set resolutely to Calcutta time, organizing the remaining fifty-six years of his life accordingly". James Clavell, in his novel King Rat, refers to news broadcasts as occurring in "Calcutta time".
- "Science, Notes and News". Science (American Association for the Advancement of Science) 23 (588): 560. 6 April 1906.
- "On the Introduction of a Standard Time for India". Proceedings of the Asiatic Society of Bengal (Calcutta: Asiatic Society of Bengal): 62–66. June 1899.
- "Odds and Ends". Indian Railways Fan Club. Retrieved 2013-06-03.
- Report of the Great Earthquake of 12th June, 1897 - Richard Dixon Oldham - Google Books
- The Asiatic Journal and Monthly Register for British and Foreign India ... - Google Books
- Holroyd, Michael (2005). Lytton Stratchey: The New Biography. p. 1883.
- Gilmour, David (2006). The Ruling Caste: Imperial Lives in the Victorian Raj. Farrar, Straus & Giroux. p. 32.
- Clavell, James (1963). King Rat. Michael Joseph. p. 67.
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