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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]
The main purpose of this page is to list the current standard time offsets of different countries, territories and regions. Information on daylight saving time or historical changes in offsets can be found in the individual offset articles (e.g. UTC+01:00) or the country-specific time articles (e.g. Time in Russia).
In 1802 Madras Time was set up by John Goldingham [7] and this was later used widely by the railways in India. [8] Local time zones were also set up in the important cities of Bombay and Calcutta and as Madras time was intermediate to these, it was one of the early contenders for an Indian standard time zone.
Calcutta Time was one of the two official 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 decided that India had two time zones: Calcutta (now Kolkata) would use the 90th meridian east and Bombay (now Mumbai) the 75th meridian ...
[77] [78] [79] Though not yet a common practice, the BIS (Bureau of Indian Standards) of the Government of India introduced the standard named "IS 7900:2001 (Revised in 2006) Data Elements And Interchange Formats – Information Interchange – Representation Of Dates And Times" which officially recommends use of the date format yyyy-mm-dd ...
In India, dates in astrology or religious purposes are written in a year-month-day format. [citation needed] The month-day-year (12/31/1999) in short format, is never used in India except regionally in Bodo. [citation needed] Mondays are the start of the week as per ISO 8601.
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For continuity with their predecessor Ephemeris Time (ET), TT and TCG were set to match ET at around Julian Date 2443 144.5 (1977-01-01T00Z). More precisely, it was defined that TT instant 1977-01-01T00:00:32.184 and TCG instant 1977-01-01T00:00:32.184 exactly correspond to the International Atomic Time (TAI) instant 1977-01-01T00:00:00.000.