What is IST?
IST stands for India Standard Time. Its offset from UTC is UTC+5:30, 5 hours 30 minutes ahead of UTC.
IST is the single time zone of all of India, five and a half hours ahead of UTC. India does not use daylight saving.
IST also stands for Irish Standard Time (UTC+1, used in Ireland in summer) and Israel Standard Time (UTC+2, used in winter). This page is about India Standard Time, UTC+5:30.
Where IST is used
India. The table shows examples, not every place. Entries in bold are on IST at that moment.
| Place | Mid-January 2026 | Mid-July 2026 | Now |
|---|---|---|---|
| Kolkata | IST (UTC+5:30) | IST (UTC+5:30) | IST (UTC+5:30) |
Time difference between IST and other cities
| City | Compared with IST, now | Changes in the next 12 months |
|---|---|---|
| New York City | 10 hours 30 minutes behind | Sun 14 Mar 2027, 07:00 UTC: 9 hours 30 minutes behind |
| Los Angeles | 13 hours 30 minutes behind | Sun 14 Mar 2027, 10:00 UTC: 12 hours 30 minutes behind |
| London | 5 hours 30 minutes behind | Sun 28 Mar 2027, 01:00 UTC: 4 hours 30 minutes behind Sun 31 Oct 2027, 01:00 UTC: 5 hours 30 minutes behind |
| Dubai | 1 hour 30 minutes behind | No change |
| Mumbai | Same time | No change |
| Singapore | 2 hours 30 minutes ahead | No change |
| Tokyo | 3 hours 30 minutes ahead | No change |
| Sydney | 5 hours 30 minutes ahead | Sat 3 Apr 2027, 16:00 UTC: 4 hours 30 minutes ahead Sat 2 Oct 2027, 16:00 UTC: 5 hours 30 minutes ahead |
A gap changes when the two places change their clocks on different dates. Dates are in UTC.
Working hours that overlap with IST
When it is 09:00 to 17:00 in IST, where is it also a working day (09:00 to 17:00)? This uses today’s clock settings, so check the meeting planner for weeks when clocks change.
| City | Shared working hours |
|---|---|
| New York City | No shared working hours |
| Los Angeles | No shared working hours |
| London | 14:30 to 17:00 in IST (09:00 to 11:30 in London) |
| Dubai | 10:30 to 17:00 in IST (09:00 to 15:30 in Dubai) |
| Mumbai | 09:00 to 17:00 in IST (09:00 to 17:00 in Mumbai) |
| Singapore | 09:00 to 14:30 in IST (11:30 to 17:00 in Singapore) |
| Tokyo | 09:00 to 13:30 in IST (12:30 to 17:00 in Tokyo) |
| Sydney | 09:00 to 11:30 in IST (14:30 to 17:00 in Sydney) |