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The time zone was established during the International Meridian Conference held at Washington, D.C. in the United States in 1884. It was then decided that India would have two time zones, Calcutta (now Kolkata), and Bombay (now Mumbai). Bombay Time was set at 4 hours and 51 minutes ahead of Greenwich Mean Time (GMT). [1] [2]
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]
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.
Mumbai is the financial capital and the most populous city proper of India with an estimated population of 12.5 million (1.25 crore). [20] Mumbai is the centre of the Mumbai Metropolitan Region, the sixth-most populous metropolitan area in the world with a population of over 23 million (2.3 crore). [21]
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 ...
UTC+5:30 is an identifier for a time offset from UTC of +05:30. This time is used in India [1] and Sri Lanka, [2] and was formerly used in Nepal, Pakistan and Bangladesh. [3] It is five and a half hours ahead of Coordinated Universal Time. Around 1.4 billion people live inside this time zone, making it the second-most populous after UTC+08:00. [4]
Bombay Time, one of the two official time zones in British India, was established in 1884 [128] during the International Meridian Conference held at Washington, D.C., in the United States. [129] Bombay time was set at 4 hours and 51 minutes ahead of Greenwich Mean Time (GMT) using the 75th east meridian. [128]
Mumbai Metropolitan Region (ISO: Muṁbaī Mahānagara Pradēśa; abbreviated to MMR and previously also known as Greater Bombay Metropolitan Area), [6] [7] is a metropolitan area consisting of Mumbai and its satellite towns in the northern Konkan division of Maharashtra in western India.