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Indian Standard Time
Indian Standard Time (IST) is the time observed throughout India, with a time offset of Universal Time +05:30 (abbreviated as UTC and sometimes written as Universal Time Coordinated, formerly and still widely called GMT). India does not observe Daylight Saving Time (DST) or other seasonal adjustments. Indian Standard Time is calculated on the basis of 82.5° E longitude, from a clock tower in Mirzapur (25.15°N 82.58°E) (near Allahabad in the state of Uttar Pradesh) which is nearly on the corresponding longitude reference line. The IST longitude divides India into two parts, the eastern (comprising the seven states of the northeast, Sikkim, Bihar, West Bengal, Orissa and Jharkhand ) and the western part (rest of the country). Since India is following a single time zone format no need to turn your watch wherever you go in India. Don't be worry by seeing sun becomes darker while travelling north-east around 4pm or sun remains brighter while in northern gujarat around 8 pm. All transporation,Banking facilities in Country are operating on the basis of IST.
Why India's Single Time Zone is Confusing?
The time difference between the eastern-most and western-most borders of the country is more than two hours. The country's east–west distance of more than 2,000 km (1,200 mi) covers over 28 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 Gujarat. Inhabitants of the north–eastern states of Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland and Tripura have to advance their clocks with the early sunrise and avoid the extra consumption of energy after daylight hours. If Sunrise at 4 am in Kohima, mumbai get Sunrise only by 6.00 am. Despite of the large difference, normal activities like working and sleeping hours and meal timing more or less remain the same across the country as it has a single time zone. Moreover Time in Countries Bordering North Eastern States also vary. If it is 4 AM in India look at time in our borders-Bangladesh and Bhutan time should be 4.30 AM, Nepal time should be 4.15 AM, Burma(Myanmar) time should be 5 AM, Tibet time should be 6.30 AM. People in North-East are demanding to allow a seprate time zone for East or to change Indian Standard Time from present +05:30 GMT to +06:00 GMT. But this demand should not be practical since it arise lot of confusion in railway network. Moreover northern parts closer to Pakistan get sun rise only later. +05:00 GMT is the time in Pakistan & Maladives. Anyway people in Southern states are happy becuase they can arise or go sleep in normal time. Srilanka also have same time zone of India. Time in Indonesia & Thailand bordering Indian Island of Andaman & Nicobar is +7.00 GMT.