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, from a clock tower in Mirzapur (25°09′N 82°35′E / 25.15°N 82.58°E / 25.15; 82.58) (near Allahabad in the state of Uttar Pradesh) which is nearly on the corresponding longitude reference line.
In the tz database it is represented by Asia/Kolkata.
Read more about Indian Standard Time: History, Criticism and Proposals, Time Signals
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