Jump to content

Indian Standard Time: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
No edit summary
Tags: Mobile edit Mobile web edit
Rescuing 5 sources and tagging 0 as dead. #IABot (v1.5)
Line 4: Line 4:
'''Indian Standard Time''' ('''IST''') is the [[time zone|time]] observed throughout [[India]] and [[Sri Lanka]], with a [[time offset]] of [[UTC+05:30]]. India does not observe [[daylight saving time]] ('''DST'''u) or other seasonal adjustments. In [[List of military time zones|military and aviation time]] IST is designated '''E*''' ("Echo-Star").<ref>{{cite web |url= http://wwp.greenwichmeantime.com/info/timezone.htm |title= Military and Civilian Time Designations |accessdate= 2006-12-02 |work=Greenwich Mean Time}}</ref>
'''Indian Standard Time''' ('''IST''') is the [[time zone|time]] observed throughout [[India]] and [[Sri Lanka]], with a [[time offset]] of [[UTC+05:30]]. India does not observe [[daylight saving time]] ('''DST'''u) or other seasonal adjustments. In [[List of military time zones|military and aviation time]] IST is designated '''E*''' ("Echo-Star").<ref>{{cite web |url= http://wwp.greenwichmeantime.com/info/timezone.htm |title= Military and Civilian Time Designations |accessdate= 2006-12-02 |work=Greenwich Mean Time}}</ref>


Indian Standard Time is calculated on the basis of 82.30' E [[longitude]], in [[Kakinada]], ({{Coord|16.58|N|82.15|E|}}) which is nearly on the corresponding longitude reference line.<ref name="two-timing">{{cite web|url=http://www.hindustantimes.com/editorial-views-on/Edits/Two-timing-India/Article1-246310.aspx |title=Two-timing India|date=2007-09-04|work=[[Hindustan Times]]|accessdate=2012-09-24}}</ref>
Indian Standard Time is calculated on the basis of 82.30' E [[longitude]], in [[Kakinada]], ({{Coord|16.58|N|82.15|E|}}) which is nearly on the corresponding longitude reference line.<ref name="two-timing">{{cite web|url=http://www.hindustantimes.com/editorial-views-on/Edits/Two-timing-India/Article1-246310.aspx|title=Two-timing India|date=2007-09-04|work=[[Hindustan Times]]|accessdate=2012-09-24|deadurl=yes|archiveurl=https://web.archive.org/web/20130509095810/http://www.hindustantimes.com/editorial-views-on/Edits/Two-timing-India/Article1-246310.aspx|archivedate=9 May 2013|df=dmy-all}}</ref>


In the [[tz database]], it is represented by [[Asia/Kolkata]].
In the [[tz database]], it is represented by [[Asia/Kolkata]].
Line 13: Line 13:
After [[Indian independence movement|independence in 1947]], the Indian 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 |accessdate=2006-11-25 |publisher=[[Indian Railways Fan Club]]}}</ref> The Central observatory was moved from [[Chennai]] to a location at Shankargarh Fort [[Allahabad district]], so that it would be as close to UTC +5:30 as possible.
After [[Indian independence movement|independence in 1947]], the Indian 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 |accessdate=2006-11-25 |publisher=[[Indian Railways Fan Club]]}}</ref> The Central observatory was moved from [[Chennai]] to a location at Shankargarh Fort [[Allahabad district]], so that it would be as close to UTC +5:30 as possible.


Daylight Saving Time (DST) was used briefly during the [[Sino-Indian War|China–Indian War of 1962]] and the [[Indo-Pakistani War of 1965|Indo–Pakistani 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 |accessdate =2006-11-25|work=Greenwich Mean Time}}</ref>{{dead link|date=July 2017}}
Daylight Saving Time (DST) was used briefly during the [[Sino-Indian War|China–Indian War of 1962]] and the [[Indo-Pakistani War of 1965|Indo–Pakistani 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 |accessdate =2006-11-25 |work =Greenwich Mean Time |deadurl =yes |archiveurl =https://web.archive.org/web/20070519085807/http://wwp.india-time.com/indian-time-zones.htm |archivedate =19 May 2007 |df =dmy-all }}</ref>


==Criticism and proposals==
==Criticism and proposals==
Line 20: Line 20:
In the late 1980s, a team of researchers proposed separating the country into two or three time zones to conserve energy. The binary system that they suggested involved a return to British–era time zones; the recommendations were not adopted.<ref name="bbc"/><ref name="thehindu2002">{{cite web|url=http://www.hindu.com/thehindu/mp/2002/01/07/stories/2002010700130300.htm |title=A matter of time |accessdate=2006-11-25 |last=S. Muthiah |date=2012-09-24 |work=[[The Hindu]] }}</ref>
In the late 1980s, a team of researchers proposed separating the country into two or three time zones to conserve energy. The binary system that they suggested involved a return to British–era time zones; the recommendations were not adopted.<ref name="bbc"/><ref name="thehindu2002">{{cite web|url=http://www.hindu.com/thehindu/mp/2002/01/07/stories/2002010700130300.htm |title=A matter of time |accessdate=2006-11-25 |last=S. Muthiah |date=2012-09-24 |work=[[The Hindu]] }}</ref>


In 2001, the government established a four–member committee under the [[Department of Science and Technology (India)|Ministry of Science and Technology]] to examine the need for multiple time zones and daylight saving.<ref name="bbc"/> The findings of the committee, which were presented to [[Parliament of India|Parliament]] in 2004 by the Minister for Science and Technology, [[Kapil Sibal]], did not recommend changes to the unified system, stating that "the prime meridian was chosen with reference to a central station, and that the expanse of the Indian State was not large."<ref>{{cite web|url=http://dst.gov.in/admin_finance/un-sq1007.htm |title=Standard Time for Different Regions |accessdate=2006-11-25 |date=2004-07-22 |work=Department of Science and Technology}}</ref>
In 2001, the government established a four–member committee under the [[Department of Science and Technology (India)|Ministry of Science and Technology]] to examine the need for multiple time zones and daylight saving.<ref name="bbc"/> The findings of the committee, which were presented to [[Parliament of India|Parliament]] in 2004 by the Minister for Science and Technology, [[Kapil Sibal]], did not recommend changes to the unified system, stating that "the prime meridian was chosen with reference to a central station, and that the expanse of the Indian State was not large."<ref>{{cite web |url=http://dst.gov.in/admin_finance/un-sq1007.htm |title=Standard Time for Different Regions |accessdate=2006-11-25 |date=2004-07-22 |work=Department of Science and Technology |deadurl=yes |archiveurl=https://web.archive.org/web/20070928010543/http://dst.gov.in/admin_finance/un-sq1007.htm |archivedate=28 September 2007 |df=dmy-all }}</ref>


Though the government has consistently refused to split the country into multiple time zones, provisions in labour laws such as the ''Plantations Labour Act, 1951'' allow the Central and State governments to define and set the local time for a particular industrial area.<ref>{{cite web|url=http://nrcw.nic.in/shared/sublinkimages/19.htm |title=A matter of time |accessdate=2006-11-25 |work=National Resource Centre for Women}}</ref> In [[Assam]], tea gardens follow a separate time zone, known as the ''Chaibagaan'' or ''Bagan'' time ('Tea Garden Time'), which is one hour ahead of IST.<ref name="HindustanTimes2008">{{cite web|url=http://www.hindustantimes.com/News-Feed/India/Change-clock-to-bagantime/Article1-304181.aspx |title= Change clock to bagantime |accessdate=2008-09-22 |last=Rahul Karmakar |date=2012-09-24 |work=[[Hindustan Times]] }}</ref> Still Indian Standard Time remains the only officially used time.
Though the government has consistently refused to split the country into multiple time zones, provisions in labour laws such as the ''Plantations Labour Act, 1951'' allow the Central and State governments to define and set the local time for a particular industrial area.<ref>{{cite web |url=http://nrcw.nic.in/shared/sublinkimages/19.htm |title=A matter of time |accessdate=2006-11-25 |work=National Resource Centre for Women |deadurl=yes |archiveurl=https://web.archive.org/web/20060319181936/http://nrcw.nic.in/shared/sublinkimages/19.htm |archivedate=19 March 2006 |df=dmy-all }}</ref> In [[Assam]], tea gardens follow a separate time zone, known as the ''Chaibagaan'' or ''Bagan'' time ('Tea Garden Time'), which is one hour ahead of IST.<ref name="HindustanTimes2008">{{cite web |url=http://www.hindustantimes.com/News-Feed/India/Change-clock-to-bagantime/Article1-304181.aspx |title=Change clock to bagantime |accessdate=2008-09-22 |last=Rahul Karmakar |date=2012-09-24 |work=[[Hindustan Times]] |deadurl=yes |archiveurl=https://web.archive.org/web/20110606065730/http://www.hindustantimes.com/News-Feed/india/Change-clock-to-bagantime/Article1-304181.aspx |archivedate=6 June 2011 |df=dmy-all }}</ref> Still Indian Standard Time remains the only officially used time.


The filmmaker [[Jahnu Barua]] has been campaigning for a separate time zone (daylight saving time) for the past 25 years. In 2010, he suggested creating a separate time zone for the Development of Northeastern Region.<ref>http://articles.timesofindia.indiatimes.com/2014-01-02/india/45797966_1_jahnu-barua-tarun-gogoi-separate-time-zone</ref>
The filmmaker [[Jahnu Barua]] has been campaigning for a separate time zone (daylight saving time) for the past 25 years. In 2010, he suggested creating a separate time zone for the Development of Northeastern Region.<ref>http://articles.timesofindia.indiatimes.com/2014-01-02/india/45797966_1_jahnu-barua-tarun-gogoi-separate-time-zone</ref>

Revision as of 19:58, 4 September 2017

IST in relation with the bordering nations

Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. India does not observe daylight saving time (DSTu) or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").[1]

Indian Standard Time is calculated on the basis of 82.30' E longitude, in Kakinada, (16°35′N 82°09′E / 16.58°N 82.15°E / 16.58; 82.15) which is nearly on the corresponding longitude reference line.[2]

In the tz database, it is represented by Asia/Kolkata.

History

Main article: Time in India

After independence in 1947, the Indian 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 Central observatory was moved from Chennai to a location at Shankargarh Fort Allahabad district, so that it would be as close to UTC +5:30 as possible.

Daylight Saving Time (DST) was used briefly during the China–Indian War of 1962 and the Indo–Pakistani Wars of 1965 and 1971.[4]

Criticism and proposals

The country's east–west distance of more than 2,933 kilometres (1,822 mi) covers over 29 degrees of longitude, resulting in the sun rising and setting almost two hours earlier on India's eastern border than in the Rann of Kutch in the far west. Inhabitants of the northeastern states have to advance their clocks with the early sunrise and avoid the extra consumption of energy after daylight hours.[5]

In the late 1980s, a team of researchers proposed separating the country into two or three time zones to conserve energy. The binary system that they suggested involved a return to British–era time zones; the recommendations were not adopted.[5][6]

In 2001, the government established a four–member committee under the Ministry of Science and Technology to examine the need for multiple time zones and daylight saving.[5] The findings of the committee, which were presented to Parliament in 2004 by the Minister for Science and Technology, Kapil Sibal, did not recommend changes to the unified system, stating that "the prime meridian was chosen with reference to a central station, and that the expanse of the Indian State was not large."[7]

Though the government has consistently refused to split the country into multiple time zones, provisions in labour laws such as the Plantations Labour Act, 1951 allow the Central and State governments to define and set the local time for a particular industrial area.[8] In Assam, tea gardens follow a separate time zone, known as the Chaibagaan or Bagan time ('Tea Garden Time'), which is one hour ahead of IST.[9] Still Indian Standard Time remains the only officially used time.

The filmmaker Jahnu Barua has been campaigning for a separate time zone (daylight saving time) for the past 25 years. In 2010, he suggested creating a separate time zone for the Development of Northeastern Region.[10]

In 2014, Chief Minister of Assam Tarun Gogoi started campaigning for another time zone for Assam and other northeastern states of India.[11] However, the proposal would need to be cleared by the Central Government of India.

In June 2017, Department of Science and Technology (DST) indicated that they are once again  studying feasibility of two time-zones for India. A proposal for both creating an additional Eastern India Timezone (EIT @ UTC+6:00) shifting default IST to UTC +5:00 and Day-light saving (IDT for IST and EID for EIT) starting on 14 April (Ambedkar Jayanti) and ending on 2 October (Gandhi Jayanti) was submitted to DST for consideration.[12]

Time signals

Official time signals are generated by the Time and Frequency Standards Laboratory at the National Physical Laboratory in New Delhi, for both commercial and official use. The signals are based on atomic clocks and are synchronised with the worldwide system of clocks that support the Coordinated Universal Time.

Features of the Time and Frequency Standards Laboratory include:

  • High frequency broadcast service operating at 10 MHz under call sign ATA to synchronise the user clock within a millisecond;
  • Indian National Satellite System satellite-based standard time and frequency broadcast service, which offers IST correct to ±10 microsecond and frequency calibration of up to ±10−10; and
  • Time and frequency calibrations made with the help of pico- and nanoseconds time interval frequency counters and phase recorders.

IST is taken as the standard time as it passes through almost the centre of India. To communicate the exact time to the people, the exact time is broadcast over the national All India Radio and Doordarshan television network. Telephone companies have dedicated phone numbers connected to mirror time servers that also relay the precise time. Another increasingly popular means of obtaining the time is through Global Positioning System (GPS) receivers.[13]

See also

References

  1. ^ "Military and Civilian Time Designations". Greenwich Mean Time. Retrieved 2 December 2006.
  2. ^ "Two-timing India". Hindustan Times. 4 September 2007. Archived from the original on 9 May 2013. Retrieved 24 September 2012. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  3. ^ "Odds and Ends". Indian Railways Fan Club. Retrieved 25 November 2006.
  4. ^ "India Time Zones". Greenwich Mean Time. Archived from the original on 19 May 2007. Retrieved 25 November 2006. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  5. ^ a b c Sen, Ayanjit (21 August 2001). "India investigates different time zones". BBC News. Retrieved 25 November 2006.
  6. ^ S. Muthiah (24 September 2012). "A matter of time". The Hindu. Retrieved 25 November 2006.
  7. ^ "Standard Time for Different Regions". Department of Science and Technology. 22 July 2004. Archived from the original on 28 September 2007. Retrieved 25 November 2006. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  8. ^ "A matter of time". National Resource Centre for Women. Archived from the original on 19 March 2006. Retrieved 25 November 2006. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  9. ^ Rahul Karmakar (24 September 2012). "Change clock to bagantime". Hindustan Times. Archived from the original on 6 June 2011. Retrieved 22 September 2008. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  10. ^ http://articles.timesofindia.indiatimes.com/2014-01-02/india/45797966_1_jahnu-barua-tarun-gogoi-separate-time-zone
  11. ^ http://www.ndtv.com/article/india/india-could-get-second-time-zone-with-assam-one-hour-ahead-466326?curl=1388743528
  12. ^ "Government assessing feasibility of different time zones in India". The Economic Times. 22 June 2017. Retrieved 18 August 2017.
  13. ^ "Satellites for Navigation". Press Information Bureau, Government of India. Retrieved 25 November 2006.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Indian_Standard_Time&oldid=798955398"