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 82.58° E longitude, in Shankargarh Fort, Mirzapur (25°09′N 82°35′E / 25.15°N 82.58°E) (in Mirzapur district 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.