IST to UTC converter
UTC is 5 hours 30 minutes behind India Standard Time year-round: India Standard Time runs at UTC+5:30 and UTC at UTC+0. To convert IST to UTC, subtract 5 hours 30 minutes from the IST time. Neither zone observes daylight saving time, so the offsets hold on every date.
India Standard Time runs at UTC+5:30, UTC at UTC+0.
IST to UTC conversion table
Every hour of the day converted. One column is enough here: the gap between the two zones is the same in winter and summer.
| India Standard Time (IST) | UTC (UTC) |
|---|---|
| 00:00 12:00 AM | 18:30 6:30 PM previous day |
| 01:00 1:00 AM | 19:30 7:30 PM previous day |
| 02:00 2:00 AM | 20:30 8:30 PM previous day |
| 03:00 3:00 AM | 21:30 9:30 PM previous day |
| 04:00 4:00 AM | 22:30 10:30 PM previous day |
| 05:00 5:00 AM | 23:30 11:30 PM previous day |
| 06:00 6:00 AM | 00:30 12:30 AM |
| 07:00 7:00 AM | 01:30 1:30 AM |
| 08:00 8:00 AM | 02:30 2:30 AM |
| 09:00 9:00 AM | 03:30 3:30 AM |
| 10:00 10:00 AM | 04:30 4:30 AM |
| 11:00 11:00 AM | 05:30 5:30 AM |
| 12:00 12:00 PM | 06:30 6:30 AM |
| 13:00 1:00 PM | 07:30 7:30 AM |
| 14:00 2:00 PM | 08:30 8:30 AM |
| 15:00 3:00 PM | 09:30 9:30 AM |
| 16:00 4:00 PM | 10:30 10:30 AM |
| 17:00 5:00 PM | 11:30 11:30 AM |
| 18:00 6:00 PM | 12:30 12:30 PM |
| 19:00 7:00 PM | 13:30 1:30 PM |
| 20:00 8:00 PM | 14:30 2:30 PM |
| 21:00 9:00 PM | 15:30 3:30 PM |
| 22:00 10:00 PM | 16:30 4:30 PM |
| 23:00 11:00 PM | 17:30 5:30 PM |
How the IST to UTC conversion works
Converting IST to UTC means taking a wall-clock time in India Standard Time (IST, UTC+5:30) and expressing the same instant in UTC (UTC, UTC+0). The arithmetic is one step: subtract 5 hours 30 minutes from any IST time, and it holds on every date of the year. Applying the gap pushes part of the day onto a different calendar date — the table below marks every row that shifts. In code, store the instant in UTC and convert with the IANA identifiers Asia/Kolkata and Etc/UTC, never with the abbreviations. One note on the source label: IST is also used for Irish Standard Time and Israel Standard Time, so the abbreviation alone is ambiguous. On the target label: UTC is the fixed reference every other offset is measured against, and it never shifts. IANA identifiers carry the full offset history of a region, including every daylight saving transition ever legislated, which is why databases, schedulers, and APIs should store them.
Best time for meetings between IST and UTC
Working hours are taken as 09:00–18:00 in each zone. The window in force depends on the date, so both halves of the year are listed where they differ.
UTC, year-round
A 9-to-6 working day in both zones overlaps for 3 hours 30 minutes: 2:30 PM–6:00 PM IST is 9:00 AM–12:30 PM UTC. Book inside that window and neither side is working outside normal hours.
Daylight saving time: which side moves
Neither India Standard Time nor UTC observes daylight saving time, so the difference stays at 5 hours 30 minutes year-round. There is no transition weekend to plan around, and neither zone has a summer abbreviation.
- India Standard Time
- Asia/Kolkata
- IST — UTC+5:30
- UTC
- Etc/UTC
- UTC — UTC+0
Frequently asked questions
What is the time difference between IST and UTC?
UTC runs 5 hours 30 minutes behind India Standard Time on every date of the year. In offset terms, India Standard Time sits at UTC+5:30 and UTC at UTC+0. So 9:00 AM IST is 3:30 AM UTC. The hour-by-hour table on this page lists the conversion for all 24 hours so you do not have to do the arithmetic.
Does the IST to UTC difference change with daylight saving time?
The difference is fixed at 5 hours 30 minutes. Neither India Standard Time nor UTC observes daylight saving time, so no date in the calendar changes the conversion. Convert against the IANA rules for the exact date rather than a remembered offset. Both zones are handled here through their IANA identifiers, Asia/Kolkata and Etc/UTC, which encode the transitions.
What time is 9 am IST in UTC?
9:00 AM IST is 3:30 AM in UTC, and it stays that way all year because the two zones stay 5 hours 30 minutes apart. The rule is the same one the whole page runs on: subtract 5 hours 30 minutes from any IST time. Check the hour-by-hour table for any other starting hour, including the rows that land on the previous or next calendar day.
What do IST and UTC stand for?
IST stands for India Standard Time. UTC stands for Coordinated Universal Time. Both are display labels rather than rules: the offsets behind them come from the IANA identifiers Asia/Kolkata and Etc/UTC. IST is also used for Irish Standard Time and Israel Standard Time, so the abbreviation alone is ambiguous. UTC is the fixed reference every other offset is measured against, and it never shifts.
Related conversions
Need more than two zones at once? The full timezone converter shows a single moment across up to six IANA timezones, for any date you choose.