About India Standard Time (IST)
India Standard Time (IST) is the official time zone for the entire country of India. It is UTC+5:30 — exactly 5 hours and 30 minutes ahead of Coordinated Universal Time (UTC). India is one of only a handful of countries in the world that uses a half-hour UTC offset rather than a full-hour increment.
India does not observe Daylight Saving Time, making IST one of the most consistent time zones for international scheduling. No matter what time of year it is — summer or winter — India is always UTC+5:30.
Frequently Asked Questions
India uses a single time zone called India Standard Time (IST), which is UTC+5:30 — 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). India is one of the few countries with a half-hour UTC offset.
No. India does not observe Daylight Saving Time (DST). India Standard Time (IST) stays at UTC+5:30 year-round. This means the time difference between India and countries that do observe DST (like the US or UK) changes depending on the season.
IST (UTC+5:30) is 10 hours 30 minutes ahead of US Eastern Standard Time (UTC-5) and 9 hours 30 minutes ahead of US Eastern Daylight Time (UTC-4). The exact offset changes when the US springs forward or falls back. Use our Time Zone Converter for a precise real-time conversion.
IST is GMT+5:30. When it is 12:00 noon GMT, it is 5:30 PM (17:30) in India. When it is 12:00 noon in India, it is 6:30 AM (06:30) in London (during GMT; 7:30 AM during BST).
India's half-hour UTC offset is a relic of colonial-era timekeeping when a compromise was struck between the times of Bombay (UTC+4:51) and Calcutta (UTC+5:54). The compromise of UTC+5:30 was adopted in 1906 and has remained unchanged, though debates about splitting India into multiple time zones resurface periodically.