Asia/Kolkata is an IANA time zone used in India. It stays on UTC+5:30 all year.
Asia/Kolkata at a glance
How Asia/Kolkata keeps time
Asia/Kolkata stays on UTC+5:30 all year. The tz database records no daylight saving time in this zone since 1970.
Countries and cities on Asia/Kolkata
Asia/Kolkata is used in India. These are the largest cities in our list that follow it.
Asia/Kolkata compared with other time zones
Differences change during the year when one side moves to or from daylight saving time, so the table shows January and July separately.
| City | Time now | Difference now | In January | In July |
|---|---|---|---|---|
| New York (United States) | --:-- | 10 h 30 min behind | 10 h 30 min behind | 9 h 30 min behind |
| Los Angeles (United States) | --:-- | 13 h 30 min behind | 13 h 30 min behind | 12 h 30 min behind |
| London (United Kingdom) | --:-- | 5 h 30 min behind | 5 h 30 min behind | 4 h 30 min behind |
| Paris (France) | --:-- | 4 h 30 min behind | 4 h 30 min behind | 3 h 30 min behind |
| Dubai (United Arab Emirates) | --:-- | 1 h 30 min behind | 1 h 30 min behind | 1 h 30 min behind |
| Singapore | --:-- | 2 h 30 min ahead | 2 h 30 min ahead | 2 h 30 min ahead |
| Tokyo (Japan) | --:-- | 3 h 30 min ahead | 3 h 30 min ahead | 3 h 30 min ahead |
| Sydney (Australia) | --:-- | 5 h 30 min ahead | 5 h 30 min ahead | 4 h 30 min ahead |
| UTC | --:-- | 5 h 30 min behind | 5 h 30 min behind | 5 h 30 min behind |
Other zones on UTC+5:30 right now
These IANA zones show the same time as Asia/Kolkata today. Their clock-change rules may differ.
Using Asia/Kolkata in software
Store and send the zone as its IANA name, Asia/Kolkata, not as a fixed offset. A fixed offset such as UTC+5:30 gives the wrong result after the next clock change.
Show the current time in Asia/Kolkata:
// JavaScript
new Intl.DateTimeFormat('en-GB', { timeZone: 'Asia/Kolkata', timeStyle: 'long' }).format(new Date());
# Python
from datetime import datetime
from zoneinfo import ZoneInfo
datetime.now(ZoneInfo('Asia/Kolkata'))
// PHP
(new DateTime('now', new DateTimeZone('Asia/Kolkata')))->format('c');
# Shell
TZ=Asia/Kolkata dateTools for time in Asia/Kolkata
- Convert a time to or from Asia/Kolkata: pick a date and time and see it in every city on your list.
- Add Mumbai to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in Asia/Kolkata and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What is the UTC offset of Asia/Kolkata?
UTC+5:30, all year.
What abbreviation does Asia/Kolkata use?
IST. Abbreviations are not unique, so use the zone name Asia/Kolkata in software.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.