Having Two Time Zones for India (Download PDF)

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Proposal from the Council of Scientific & Industrial Research՚s National Physical Laboratory (CSIR-NPL) . The earth will be divided into 360 zones if the lines of longitude are drawn exactly a degree apart. Earth spins 360° in 24 hours. A longitudinal distance of 15° represents 1 hour. 1° represents a time separation of 4 minutes. Time zones are often demarcated by bent lines rather than straight lines of longitude. me zones are often demarcated by bent lines rather than straight lines of longitude.

  • Geographic -zero line‖ runs through Greenwich, London.
  • Identifies the GMT (Greenwich Mean Time) known as Universal Coordinated Time (UTC) currently.
  • Maintained by the Bureau of Weights and Measures (BIPM) in France.

Case with India

  • The Indian Standard Time (IST) is maintained by CSIR-NPL.
  • The IST is based on a line of longitude that runs through Mirzapur in UP.
  • India extends from 68°7 ‘E to 97°25’ E (spread of 29°) , representing almost two hours from the geographic perspective.
  • The early sunrise in the easternmost parts causes the loss of many daylight hours by the time.
  • The early sunset in the region, leads to higher consumption of electricity along with the costs associated.


  • Not favoured by the government earlier citing the complexities involved.
  • Impracticability of two time zones.
  • Frequent risk of railway accidents was cited.


  • Two time zones will be demarcated connecting northeast to the rest of India.
  • The Railway Signals are yet to be automated fully.
  • Managing the train time manually while crossing the border without any untoward incidents.
  • Nearly 20 million kWh energy could be saved every year if two time zones are followed.

- Published/Last Modified on: March 28, 2020


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