A strong demand of a separate time zone by northeast populace has been a matter of great debate for a very long period. However, no implementable solution to this genuine problem has yet been proposed. The CSIR-National Physical Laboratory, CSIR-NPL (the National Measurement Institute, NMI, of India and custodian of Indian Standard Time, IST) proposes an implementable [2] solution that puts the country in two time zones: (i) IST-I (UTC + 5 : 30 h, represented by longitude passing through 82°33′E) covering the regions falling between longitude 68°7′E and 89°52′E and (ii) IST-II (UTC + 6 : 30 h, represented by longitude passing through 97°30′E) encompassing the regions between 89°52′E and 97°25′E.
Original Source [3]
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/necessity-%E2%80%98two-time-zones-ist-i-utc-5-30-h-and-ist-ii-utc-6-30-h%E2%80%99-india-and-its
[2] http://www.indiaenvironmentportal.org.in/files/file/two_time_zones_India.pdf
[3] http://www.currentscience.ac.in/Volumes/115/07/1252.pdf
[4] http://admin.indiaenvironmentportal.org.in/category/author/lakhi-sharma
[5] http://admin.indiaenvironmentportal.org.in/category/author/s-de
[6] http://admin.indiaenvironmentportal.org.in/category/author/p-kandpal-et-al
[7] http://admin.indiaenvironmentportal.org.in/category/journal/current-science
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy-efficiency
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/assam
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/north-east
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/council-scientific-and-industrial-research-csir