India Standard Time is UTC+05:30 year-round and is used across India. It does not change for daylight saving.
Detecting your timezone for a personal comparison…
Now
IST is a half-hour offset, which often surprises people converting from whole-hour zones such as UTC, GMT, or Gulf Standard Time. The IANA identifier Asia/Kolkata (formerly Calcutta) covers the entire country; India has a single civil time despite spanning a wide longitude. Sri Lanka uses the same UTC+05:30 offset via Asia/Colombo. Irish Standard Time also abbreviates to IST in summer — this page follows the far more common search intent for India.
The offset shown above is computed from Asia/Kolkata at page render time using Intl.DateTimeFormat. It can change when daylight saving starts or ends.
India does not observe daylight saving time. IST remains UTC+05:30 every day of the year.
India Standard Time (IST) uses the IANA identifier Asia/Kolkata. India Standard Time is UTC+05:30 year-round and is used across India. It does not change for daylight saving.
Right now India Standard Time is UTC+05:30. The live abbreviation reported by the timezone database is GMT+5:30.
India does not observe daylight saving time. IST remains UTC+05:30 every day of the year.
Use the converter with Asia/Kolkata as the source zone, or open the Time Zone Converter and pick a city that uses IST. Offsets update automatically when daylight saving begins or ends.