<P> 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 (DSTu) or other seasonal adjustments . In military and aviation time IST is designated E * ("Echo - Star"). </P> <P> Indian Standard Time is calculated on the basis of 82.30' E longitude, in Mirzapur, Uttar Pradesh, which is nearly on the corresponding longitude reference line . </P>

India is divided into how many time zones
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