IST Full Form – What is the full form of IST ? Time is a crucial aspect of our lives, and knowing the right time is essential for synchronization and coordination. 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? 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.