IST full form is Indian Standard Time, the zone of time observed in India and Sri Lanka. Learn about the history, calculation, advantages and disadvantages of IST , and the difference between IST and GMT. IST can stand for different full forms in various categories, such as time zones, airports, universities, and more. Find out the meaning of IST in different contexts and see examples of usage. IST TIME Full Form - IST is designated E" ("echo-star") in military and aviation time. Indian Standard Time is found based on 82.5°E longitude in Mirzapur city of Uttar Pradesh.
