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The 82˚30’ E longitude is taken as the Standard Time Maridian of India, as it passes through the middle of India (from Naini, near Allahabad). 
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Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, 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").
Indian Standard Time is calculated on the basis of 82.5° E longitude, in Shankargarh Fort (25.15°N 82.58°E) (in Allahabad district in the state of Uttar Pradesh) which is nearly on the corresponding longitude reference line.