Indian Standard Time

Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time (DST) 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 82.5' E longitude, in Mirzapur (Amravati Chauraha), Uttar Pradesh, which is nearly on the corresponding longitude reference line.[2]

Indian Standard Time
  Indian Standard Time
UTC offset
Current time
01:05, 19 March 2019 IST [refresh]
Observance of DST
DST is not observed in this time zone.


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 in Allahabad district, so that it would be as close to UTC+05:30 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. Proposals for creating an additional Eastern India Time (EIT at UTC+06:00, shifting default IST to UTC+05:00 and Daylight saving (Indian Daylight Time for IST and Eastern India Daylight Time 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


  1. ^ "Military and Civilian Time Designations". Greenwich Mean Time. Retrieved 2006-12-02.
  2. ^ "Two-timing India". Hindustan Times. 4 September 2007. Archived from the original on 9 May 2013. Retrieved 24 September 2012.
  3. ^ "Odds and Ends". Indian Railways Fan Club. Retrieved 2006-11-25.
  4. ^ "India Time Zones". Greenwich Mean Time. Archived from the original on 19 May 2007. Retrieved 25 November 2006.
  5. ^ a b c Sen, Ayanjit (2001-08-21). "India investigates different time zones". BBC News. Retrieved 2006-11-25.
  6. ^ S. Muthiah (2012-09-24). "A matter of time". The Hindu. Retrieved 2006-11-25.
  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.
  8. ^ "A matter of time". National Resource Centre for Women. Archived from the original on 19 March 2006. Retrieved 25 November 2006.
  9. ^ Rahul Karmakar (24 September 2012). "Change clock to bagantime". Hindustan Times. Archived from the original on 6 June 2011. Retrieved 22 September 2008.
  10. ^ "Gogoi for separate time zone for Assam - Times of India". The Times of India. Retrieved 2018-05-10.
  11. ^ "India could get second time zone with Assam one hour ahead".
  12. ^ "Government assessing feasibility of different time zones in India". The Economic Times. 2017-06-22. Retrieved 2017-08-18.
  13. ^ "Satellites for Navigation". Press Information Bureau, Government of India. Retrieved 2006-11-25.

External links

1906 in India

Events in the year 1906 in India.

Allahabad Observatory

The Allahabad Observatory located in the suburb of Jhusi, just outside Allahabad is the centre responsible for maintaining the Indian Standard Time. The observatory is located at 82.5°E longitude, which translates to an exact time difference of 5 hours and 30 minutes ahead of Coordinated Universal Time (UTC) i.e. UTC+05:30.

Bombay Time

Bombay Time was one of the two official time zones established in British India in 1884. 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, with Calcutta (now Kolkata) using the 90th meridian east and Bombay (now Mumbai) the 75th meridian east. Bombay Time was set at 4 hours and 51 minutes ahead of Greenwich Mean Time (GMT).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. During the conversion in Bombay, Bal Gangadhar Tilak, a prominent freedom fighter of the Indian independence movement was put on trial in a bombing case. With public sentiment against the government, prominent barrister Pherozeshah Mehta argued against the change. He managed to stall proceedings in the Bombay Municipal Corporation for a few days by arguing that the government did not take the people into confidence. Faced with rising public resentment over the trial, the government shelved the conversion, and Bombay Time was maintained until 1955.

Calcutta Time

Calcutta time was one of the two 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 (Mumbai) the 75th meridian east.

Calcutta time was described as being 24 minutes ahead of Indian standard time and one hour and three minutes ahead of Bombay standard time (UTC+5:54). It has also been described as 32 minutes and 20 seconds ahead of Madras time (UTC+5:53:20).Even when Indian Standard Time (IST) was adopted on 1 January 1906, Calcutta time remained in effect until 1948 when it was abandoned in favour of IST.In the latter part of the nineteenth century, Calcutta time was the dominant time of the Indian part of the British empire with records of astronomical and geological events recorded in it. Willian Strachey, an uncle of Lytton Strachey was said to have visited Calcutta once and then "kept his own watch set resolutely to Calcutta time, organizing the remaining fifty-six years of his life accordingly". James Clavell, in his novel King Rat, refers to news broadcasts as occurring in "Calcutta time".


Kakinada (formerly called Cocanada) pronunciation is one of the largest cities and the district headquarters of East Godavari district in the Indian state of Andhra Pradesh. It is the second most populated city of East Godavari district after Rajahmundry. The city has a population of about 4.43 Lakhs as of 2011 census.

Kakinada is globally known for its sweet called kaaja. Along with these it is also known for its town planning. The Indian Standard Time (IST) passes through this city. Kakinada used to have about 12 cinema halls along a road (Cinema Road) and is known as Second Madras (because Chennai used to have many cinema halls along a road). It is also known for its scenic beach beauty alongside Visakhapatnam.

The city is a home for many Tollywood Film Celebrities namely Suryakantham, Rao Gopal Rao, Krishna Bhagawan, Goutham Raju. The city was selected as one of the hundred Indian cities to be developed as a smart city under PM Narendra Modi's flagship, Smart Cities Mission. It is one of the fastest developing cities of Andhra Pradesh.

Madras Time

Madras Time was a time zone established in 1802 by John Goldingham, the first official astronomer of the British East India Company in India when he determined the longitude of Madras as 5 hours, 21 minutes and 14 seconds ahead of Greenwich Mean Time. It has been described as 9 minutes from UTC+05:30 and 33 minutes and 20 seconds behind Calcutta time which puts it at (UTC+05:21). Before India's independence, it was the closest precursor to Indian Standard Time which is derived from the location of the observatory at 82.5°E longitude in Shankargarh Allahabad in Uttar Pradesh.After Bombay time and Calcutta time were set up as the two official time zones of British India in 1884, railway companies in India began to use Madras time as an intermediate time zone between the two zones. This led to Madras time also being known as "Railway time of India".

Maya Bazar

Maya is a town in Faizabad district, the Indian state of Uttar Pradesh and is Subpost Office of Faizabad.

The nearest railway station to Maya Bazar is Bilhar Ghat which is located in and around 4.7 kilometer distance. The following table shows other railway stations and its distance from Mamakudi.

Bilhar Ghat railway station 4.7 KM.

Goshainganj railway station 12.7 KM.

Darshannagar railway station 14.2 KM.

Ayodhya railway station 17.6 KM.

Bharatkund railway station 18.8 KM.

Maya Bazar is located around 29.1 kilometers away from its district headquarters, Faizabad. The other nearest district headquarters is Basti, situated at 25.3 KM distance from Maya Bazar . Surrounding districts from Maya Bazar are as follows.

Basti ( basti ) district 25.3 KM.

Gonda ( gonda ) district 74.6 KM.

Sant_Kabir_Nagar ( khalilabad ) district 77.2 KM.

Maharajganj ( maharajganj ) district 91.8 KM.

Maya Bazar's nearest town/city/important place is Gosainganj located at the distance of 11.6 kilometer. Surrounding town/city/TP/CT from Maya Bazar are as follows.

Gosainganj 11.6 KM.

Faizabad 18.6 KM.

Ayodhya 18.7 KM.

Bhadarsa 18.8 KM.

Bikapur 19.7 KM.

Maya Bazar nearest schools has been listed as follows.

Din Dayal School 0.2 KM.

Tiwari Ka Purwa Primary School Rakaura 1.8 KM.

My School Ritesh 3.3 KM.

Primary School Dalpatpur 4.0 KM.

Kandipur School 5.9 KM.

Dalpatpur village is located in the UTC 5.30 time zone and it follows Indian Standard Time (IST). Dalpatpur sunrise time varies 1 minute from IST. The vehicle driving side in Dalpatpur is left; all vehicles should take left side during driving. Dalpatpur people are using its national currency, which is Indian Rupee, and its international currency code is INR. Dalpatpur phones and mobiles can be accessed by adding the Indian country dialing code +91 from abroad. Dalpatpur people are following the dd/mm/yyyy date format in day-to-day life. Dalpatpur domain name extension ( cTLD) is .in .


Mirzapur pronunciation is a city in Uttar Pradesh, India, roughly 650 km from both Delhi and Kolkata, almost 84 km from Allahabad and 59 km from Varanasi. It has a population of 2,496,970 of which male and female were 1,312,302 and 1,184,668 respectively. It is known for its carpets and brassware industries. The city is surrounded by several hills and is the headquarters of Mirzapur district. It is famous for the holy shrine of Vindhyachal, Ashtbhuja and Kali khoh and also Devrahwa Baba ashram. It has many waterfalls and natural spots.

Nepal Standard Time

Nepal Standard Time (NPT) is the time zone for Nepal. With a time offset from Coordinated Universal Time (UTC) of UTC+05:45 all over Nepal, it is one of only three time zones with a 45-minute offset from UTC. (The others are Chatham Island Standard Time, with an offset of UTC+12:45, and the unofficial Australian Central Western Time, with an offset of UTC+08:45.)NPT is an approximation of Kathmandu mean time, which is 5:41:16 ahead of UTC. The standard meridian passes through the peak of Gaurishankar mountain about 100 km east of Kathmandu.Nepal used local solar time until 1920, in Kathmandu UTC+5:41:16. In 1920, Nepal adopted Indian Standard Time, UTC+05:30. In 1986 Nepal advanced their clocks by 15 minutes, giving them a time zone of UTC+05:45.


PSLV-C5 was the fifth operational launch and overall eighth mission of the Polar Satellite Launch Vehicle program. This launch was also the fifty-second launch by the Indian Space Research Organisation (IRSO) since its first mission on 1 January 1962. The vehicle carried and injected India's remote sensing satellite Resourcesat-1 (also known as IRS-P6) into a sun-synchronous orbit; this was the heaviest and most sophisticated satellite built by IRSO through 2003. PSLV-C5 was launched at 04:52 hours Coordinated Universal Time (10:22 hours Indian Standard Time) on 17 October 2003 from Satish Dhawan Space Centre.


PSLV-C6 was the sixth operational launch and overall ninth mission of the PSLV program. This launch was also the fifty-fourth launch by Indian Space Research Organisation since its first mission on 1 January 1962. The vehicle carried and injected India's two satellites; Cartosat-1 (a.k.a. IRS-P5) and HAMSAT into the Sun-synchronous orbit. PSLV-C6 was launched at 04:44 hours Coordinated Universal Time (10:14 hours Indian Standard Time) on 5 May 2005 from the second launch pad of the Satish Dhawan Space Centre.

Rekka Katti Parakkudhu Manasu

Rekka Katti Parakkudhu Manasu (Tamil: றெக்கை கட்டி பறக்குது மனசு) is an Indian Tamil-language television soap opera starring Siddharth and Sameera. Zee Tamil broadcasts the series each weeknight from 19 June 2017 at 21:30 (IST). On 23 April 2018, the show shifted to airs Monday through Saturday at 22:00 (IST).On 04 March, the show shifted to airs Monday through Friday at 18:30(Indian Standard Time)

The show is produced by Syed Anwar and Sameera Sherief, and is a remake of the Marathi language television series Tujhyat Jeev Rangala which aired on Zee Marathi from the year 2016.

Sri Lanka Standard Time

Sri Lanka Standard Time (SLST) (Sinhala: ශ්‍රී ලංකාවේ සම්මත වේලාව Shri Lankavay Sammatha Velava Tamil: இலங்கை நியம நேரம்) is the time zone for Sri Lanka. It is 5 hours and 30 minutes ahead of GMT/UTC (UTC+05:30).The Sri Lanka Time reverted on 15 April 2006 to match Indian Standard Time calculated from the Allahabad Observatory in India 82.5 ° longitude East of Greenwich, the reference point for GMT.

The entire country shares the same time. Since 1880, Ceylon or Sri Lanka Time has varied between UTC+05:30 to UTC+06:30.

In 1880, it was UTC+05:30. During World War II, in January 1942, when the Japanese were on the verge of invading Ceylon, the time was shifted to UTC+06:00. In September 1942, it was further advanced to UTC+06:30.

When the War ended in 1945, Ceylon reverted to UTC+05:30 to be the same as India. But in May 1996, it was changed to UTC+06:30 for daylight saving during a severe power shortage in Sri Lanka. The clocks were put back by half an hour to UTC+06:00 in October 1996, though it was changed back again to UTC+05:30 in April 2006. By changing the time zone, the government hoped to bring the island in line with India. Sir Arthur C. Clarke, who was living in Sri Lanka at that time, protested against the switch, saying that it will make life inconvenient to everyone who has to relate to the rest of the world.Currently Sri Lanka does not observe daylight saving time, though it was used during World War II.

Time in India

The Republic of India uses one time zone, which is Indian Standard Time (IST). This is UTC+05:30 — that is, five and a half hours ahead of Coordinated Universal Time. India does not observe daylight saving time (DST or summer time).

The official time signal is given by the Time and Frequency Standards Laboratory. The IANA time zone database contains only one zone, namely Kolkata. The date and time notation in India shows some specialties.

Time zone

A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions because it is convenient for areas in close commercial or other communication to keep the same time.

Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12:00 to UTC+14:00), but a few zones are offset by 30 or 45 minutes (e.g. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, and Indian Standard Time is UTC+05:30).

Some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour. Many land time zones are skewed toward the west of the corresponding nautical time zones. This also creates a permanent daylight saving time effect.


Vindhyachal pronunciation is a town in Mirzapur District of Uttar Pradesh state in northern India. The city is a Hindu pilgrimage site having the temple of Vindhyavasini, who according to Markandeya Purana had incarnated to kill the demon Mahishasura. The detailed description has been given in 'Durga Saptashati' Chapter of Markandeya Purana. The river Ganga flows through this city. The Indian Standard Time (IST) line passes through the Vindhyachal railway station.

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