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 is the time zone used in India, with a UTC offset of +05:30. It is calculated from the reference longitude of 82°30'E near Allahabad and is not adjusted for daylight saving. IST - Frequently Asked Questions What is the full form of IST in Regional Time Zones, Time? Expand full name of IST . What does IST stand for? Is it acronym or abbreviation? It shows the time zone boundaries, which run along the current de facto border dividing Kashmir between India and Pakistan ("Line of Control"). Currently observing IST . Areas with same time currently (UTC +5:30). India Standard Time ( IST ) is 5:30 hours ahead of Coordinated Universal Time (UTC).