What is IST(stands for Indian Standard Time)
IST stands for Indian Standard Time. It is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. [Coordinated Universal Time (UTC), another name for GMT].
Indian Standard Time is calculated based on the 82.5° E longitude in Shankargarh Fort (25.15°N 82.58°E) (in Allahabad district in the state of Uttar Pradesh).