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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.
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]
UTC+00:00 (GMT in winter/BST in summer) – Main territory of the United Kingdom, Saint Helena, Ascension and Tristan da Cunha, Guernsey, Isle of Man, Jersey UTC+01:00 – Gibraltar UTC+02:00 – Akrotiri and Dhekelia UTC+06:00 – British Indian Ocean Territory: Time in the United Kingdom: Canada: 6
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round.
It was determined as 5 hours, 53 minutes and 20 seconds ahead of Greenwich Mean Time (UTC+5:53:20). Calcutta Time was described as being 23 minutes and 20 second ahead of Indian standard time and one hour, two minutes and 20 seconds ahead of Bombay Time. [1] It has also been described as 32 minutes and 6 seconds ahead of Madras Time (UTC+5:21: ...
Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+5:30. India does not observe daylight saving time (DST) or other seasonal adjustments, although DST was used briefly during the Sino–Indian War of 1962, and the Indo–Pakistani Wars of 1965 and 1971. In certain time-zone maps, IST is designated as E*.
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] However, Bombay Time was difficult to convert to Indian Standard Time (IST) after it was adopted on 1 January 1906 as the official time zone of India.