How many hours ahead of Eastern Time is India?
India sits at UTC+5:30. Eastern Standard Time sits at UTC-5. That puts India 10 hours 30 minutes ahead.
From mid-March to early November, the Eastern zone shifts to UTC-4. The gap narrows to 9 hours 30 minutes.
To convert IST to EST: subtract 10 hours 30 minutes.
To convert EST to IST: add 10 hours 30 minutes.
At 09:30 IST in January, clocks in New York read 23:00 EST the evening before. The same 09:30 IST in July gives you 00:00 EDT, midnight at the start of the same calendar day.
How many hours ahead of Pacific Time is India?
Pacific Standard Time is UTC-8. India leads by 13 hours 30 minutes. During Pacific Daylight Time (UTC-7), the lead shrinks to 12 hours 30 minutes.
To convert IST to PST: subtract 13 hours 30 minutes.
To convert PST to IST: add 13 hours 30 minutes.
At 10:00 IST in January, Los Angeles clocks show 20:30 PST the evening before. In July, 10:00 IST lands at 21:30 PDT the evening before.
The gap is wide enough that the date flips almost every time. An Indian morning is the US West Coast’s late evening on the prior calendar day.
When does the IST to EST and PST gap change?
India holds at UTC+5:30 all year. The United States moves its clocks forward on the second Sunday in March and back on the first Sunday in November.
The IST-to-US gap is never a single fixed number. It is two numbers, and the changeover happens twice. The gap loses one hour in spring and regains it in autumn.
On 15 January 2026, New York is 10.5 hours behind New Delhi. On 15 July 2026, New York is 9.5 hours behind. Los Angeles is 13.5 hours behind on 15 January and 12.5 hours behind on 15 July.
Eastern Time: winter gap vs summer gap
| Condition | EST (winter) | EDT (summer) |
|---|---|---|
| Offset | UTC-5 | UTC-4 |
| Gap from IST | 10 hours 30 minutes | 9 hours 30 minutes |
| 12:00 IST | 01:30 EST same day | 02:30 EDT same day |
| 18:30 IST | 08:00 EST same day | 09:00 EDT same day |
| 09:00 EST | 19:30 IST same day | 18:30 IST same day |
Winter: India 10.5 hours ahead. Summer: India 9.5 hours ahead.
Pacific Time: winter gap vs summer gap
| Condition | PST (winter) | PDT (summer) |
|---|---|---|
| Offset | UTC-8 | UTC-7 |
| Gap from IST | 13 hours 30 minutes | 12 hours 30 minutes |
| 12:00 IST | 22:30 PST prior day | 23:30 PDT prior day |
| 08:00 IST | 18:30 PST prior day | 19:30 PDT prior day |
| 10:00 PST | 23:30 IST same day | 22:30 IST same day |
Winter: India 13.5 hours ahead. Summer: India 12.5 hours ahead.
IST to EST and PST at six key points of the day
| IST | EST (winter) | EDT (summer) | PST (winter) | PDT (summer) |
|---|---|---|---|---|
| 06:00 | 19:30 prior | 20:30 prior | 16:30 prior | 17:30 prior |
| 09:00 | 22:30 prior | 23:30 prior | 19:30 prior | 20:30 prior |
| 12:00 | 01:30 same | 02:30 same | 22:30 prior | 23:30 prior |
| 15:00 | 04:30 same | 05:30 same | 01:30 same | 02:30 same |
| 18:00 | 07:30 same | 08:30 same | 04:30 same | 05:30 same |
| 21:00 | 10:30 same | 11:30 same | 07:30 same | 08:30 same |
| 00:00 | 13:30 prior | 14:30 prior | 10:30 prior | 11:30 prior |
Why is India often a day ahead of the US?
Gaps between 9.5 and 13.5 hours mean most conversions cross midnight. India rolls into the next calendar day while the United States is still finishing the previous one.
A common trap: scheduling a 10:00 IST meeting in winter for someone on the US East Coast. The correct conversion is 23:30 EST, but that is the prior calendar day. Book it for “22:30” by mistake and you miss it.
At 20:00 IST in summer, Los Angeles shows 07:30 PDT the same morning. That works. At 20:00 IST in winter, Los Angeles shows 06:30 PST, still the same day but barely. Push to 21:00 IST in winter and you hit 07:30 PST. Push to 22:00 IST and it becomes 08:30 PST.
The safest move: write the full date and time every time. “Monday 10:00 IST” and “Sunday 23:30 EST” are the same moment. Confirm the date out loud.
IST to EST and PST conversion errors that cost an hour
Forgetting that the US shifts its clocks. The gap is not the same in January and July. Use the offset that matches the month.
Assuming India moves too. India has no daylight saving. The gap changes only because the US does.
Mixing standard and daylight offsets. EST is UTC-5, not UTC-4. PST is UTC-8, not UTC-7. Get this wrong and you are off by exactly one hour.
Letting software resolve “IST” to the wrong zone. IST also stands for Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1). Some scheduling tools pick the wrong one. Always spell out “India Standard Time” or use UTC+5:30 for formal invitations.
Ignoring the date. Converting the hours while skipping the date books calls on the wrong day. Confirm that 09:00 IST on Tuesday is 22:30 EST on Monday.
For more on scheduling with US teams, see the best time to call India from the US. For a side-by-side visual of India and US zones, use the India to USA time page.