IST — India Standard Time
IST is UTC+05:30 on every date, with no daylight saving. New Delhi keeps it all year.
Current time in IST
20:52:15
India Standard Time · UTC+05:30
About IST
India uses a single time zone with a 30-minute offset and does not observe daylight saving time. IST is also used as an abbreviation for Irish Standard Time and Israel Standard Time.
Working with IST
No other zone in this directory uses UTC+05:30. No zone in this directory sits exactly one hour either side of IST; the nearest listed offsets belong to NPT (UTC+05:45) and PKT (UTC+05:00).
The letters IST are also used for Israel Standard Time (UTC+02:00) and Irish Standard Time (UTC+01:00). Quote the IANA identifier, Asia/Kolkata, wherever the meaning has to be unambiguous.
Clock changes in IST
India Standard Time has no clock change at any point in the year; UTC+05:30 applies on every date, in New Delhi as everywhere else on the zone.
Clock history of Asia/Kolkata
| Period | Clocks set to | Seasonal changes |
|---|---|---|
| since 1945 | UTC+05:30 | none |
| 1942–1945 | UTC+06:30 | none |
| 1906–1942 | UTC+05:30 | one, in 1941 |
| 1900–1906 | UTC+05:21:10 | none |
Who keeps UTC+05:30
All year: New Delhi, Mumbai, Kolkata, Bengaluru, Chennai, Hyderabad, Ahmedabad, Pune, Jaipur and Colombo.
Countries and territories that keep UTC+05:30 all year, from every entry in the tz database: India and Sri Lanka.
Where IST stands today
India Standard Time is UTC+05:30 today and will be UTC+05:30 on every other day. A recurring meeting anchored to IST never drifts against UTC, which makes it a dependable reference for logs kept in New Delhi and for schedules that run across a whole year.
A working day on IST
| Place | IST’s 09:00–17:00 there | Over the next 12 months |
|---|---|---|
| UTC | 03:30–11:30 | — |
| New York | 22:30–06:30 (previous day) / 23:30–07:30 (previous day) | none all year |
| London | 03:30–11:30 / 04:30–12:30 | 2 h 30 min to 3 h 30 min |
| Tokyo | 12:30–20:30 | always 4 h 30 min |
At 09:00 on a Monday on IST time, Lima, Mexico City, New York, Bogotá, Los Angeles, Toronto and 20 more are still on Sunday. For part of the year, so is Santiago. By 17:00 on a Friday on IST time, Auckland and Wellington have reached Saturday for part of the year; no other city in this directory has.
Sunrise and sunset on IST time in New Delhi
For the working hours New Delhi shares with New York, London and Tokyo, and for its sunrise and sunset through the year, see the New Delhi page.
How IST compares with other zones
Right now IST runs ahead of UTC, New York, London, Berlin, Dubai and Los Angeles and behind Singapore, Tokyo and Sydney.
| Zone | UTC offset | Difference from IST | Over the next 12 months |
|---|---|---|---|
| UTC | UTC+00:00 | 5h 30m ahead | all year |
| New York | UTC-05:00 | 10h 30m ahead | 10h 30m ahead / 9h 30m ahead |
| London | UTC+00:00 | 5h 30m ahead | 5h 30m ahead / 4h 30m ahead |
| Berlin | UTC+01:00 | 4h 30m ahead | 4h 30m ahead / 3h 30m ahead |
| Dubai | UTC+04:00 | 1h 30m ahead | all year |
| Singapore | UTC+08:00 | 2h 30m behind | all year |
| Tokyo | UTC+09:00 | 3h 30m behind | all year |
| Sydney | UTC+11:00 | 5h 30m behind | 4h 30m behind / 5h 30m behind |
| Los Angeles | UTC-08:00 | 13h 30m ahead | 13h 30m ahead / 12h 30m ahead |
Cities using IST
Convert IST to another zone
Related time zones
Time zone rules: IANA tz database release 2026c, applied when this page was generated on 2026-11-02.
Frequently asked questions
What is IST?
India Standard Time, IST, is UTC+05:30. India uses a single time zone with a 30-minute offset and does not observe daylight saving time. IST is also used as an abbreviation for Irish Standard Time and Israel Standard Time.
What is the IANA identifier for IST?
Asia/Kolkata, named after Kolkata. Its clock last changed on October 15, 1945, from UTC+06:30 to UTC+05:30, and it has kept UTC+05:30 since.
Does IST change for daylight saving?
No. India Standard Time keeps UTC+05:30 on every date; no other listed zone keeps that offset.
What time is it on IST when it is 09:00 in London?
14:30 until March 28, 2027 and from October 31, 2027; 13:30 from March 28, 2027 to October 31, 2027.