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 was
India had two time zones: Calcutta (now Kolkata) would
90th meridian east
90th meridian east and Bombay (Mumbai) the 75th meridian east.
Calcutta time was described as being 24 minutes ahead of Indian
standard time and one hour and three minutes ahead of Bombay standard
time (UTC+5:54). It has also been described as 32 minutes and 20
seconds ahead of
Madras time (UTC+5:53:20).
Indian Standard Time
Indian Standard Time (IST) was adopted on 1 January 1906,
Calcutta time remained in effect until 1948 when it 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 it. 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".
Indian Standard Time
Port Blair mean time
Railway time § India
^ "Science, Notes and News". Science. American Association for the
Advancement of Science. 23 (588): 560. 6 April 1906.
doi:10.1126/science.23.588.558. JSTOR 1631795.
^ "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
^ Richard Dixon Oldham (1899). Report of the Great Earthquake of 12th
June, 1897. Office of the Geological survey. p. 20.
^ The Asiatic Journal and Monthly Register for British and Foreign
India, China, and Australia. Parbury, Allen, and Co. 1834.
^ Holroyd, Michael (2005). Lytton Stratchey: The New Biography.
p. 1883. ISBN 9780393347951.
^ 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.
"Indian Time Zones (IST)". Greenwich Mean Time (GMT). Retrieved
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