Editing Indian Standard Time (section)

==History==
{{Main|Time in India}}
The Indian Standard Time was adopted on 1 January 1906 during the [[British Raj|British era]] with the phasing out of its precursor [[Madras Time]] (Railway Time),<ref>{{cite web|url=https://www.thehindu.com/news/cities/chennai/Madras-375-When-Madras-clocked-the-time/article60343496.ece |title=When Madras clocked the time |work=The Hindu |last=Menon |first=Nitya |date=22 August 2014 |access-date=1 January 2023 }}</ref> and after [[Indian Independence movement|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.<ref name="Princely states">{{cite web|url=http://www.irfca.org/faq/faq-misc.html |title=Odds and Ends |access-date=2006-11-25 |publisher=Indian Railways Fan Club}}</ref> The Central observatory was moved from [[Chennai]]  to a location at Shankargarh Fort in [[Allahabad district]], so that it would be as close to [[UTC+05:30]] as possible.<ref name="Hans 2018">{{cite news |title=India Standard Time |url=https://www.thehansindia.com/posts/index/Hans-Classroom/2018-04-19/India-Standard-Time/374988 |access-date=27 June 2021 |work=The Hans India |publisher=Hyderabad Media House Limited |date=19 April 2018}}</ref>

Daylight Saving Time (DST) was used briefly during the [[Sino-Indian War|China–India War of 1962]] and the Indo-Pakistani [[Indo-Pakistani War of 1965|Wars of 1965]] and [[Indo-Pakistani War of 1971|1971]].<ref name="timez">{{cite web |url =http://wwp.india-time.com/indian-time-zones.htm |title =India Time Zones |access-date =2006-11-25 |work =Greenwich Mean Time |url-status =dead |archive-url =https://web.archive.org/web/20070519085807/http://wwp.india-time.com/indian-time-zones.htm |archive-date =19 May 2007 |df =dmy-all }}</ref>

===Former timezones===
{| class="wikitable" style="text-align: center; font-size:95%;"
|-
! Time Zone
! UTC
! Period
! Purpose
|-
| [[Bombay Time]]
| [[UTC+04:51]]
| 1884–1955
| Official
|-
| [[Calcutta Time]]
| [[UTC+05:30|UTC+05:53:20]]
| 1884–1948
| Official
|-
| [[Madras Time]]
| [[UTC+05:00|UTC+05:21:14]]
| 1802–1906
| Railways
|-
| [[Port Blair mean time]]
| [[UTC+06:00|UTC+06:10:37]]
| 19th century–1906
| Local
|}