How many hours is IST ahead of EDT?
As abbreviations, EDT is always 9.5 hours behind of IST: IST is UTC+5:30 and EDT is UTC−4. To convert, subtract 9.5 hours.
Check which label you actually need: EDT (Eastern Time is on EST today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now EDT is 10.5 hours behind of IST.
When the IST to EDT time difference changes
For most of the year EDT is 9.5 hours behind of IST. From 1 November to 31 December 2026, EDT is 10.5 hours behind of IST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
| Dates | EDT vs IST | Length |
|---|---|---|
| 1 November 2026 to 31 December 2026 | 10.5 hours behind | 61 days |
| 1 January 2027 to 13 March 2027 | 10.5 hours behind | 72 days |
| 14 March 2027 to 6 November 2027 | 9.5 hours behind | 238 days |
| 7 November 2027 to 31 December 2027 | 10.5 hours behind | 55 days |
Calling hours for IST and EDT
- When EDT is 9.5 hours behind of IST: no shared 09:00 to 17:00 hours; try 17:00 in IST (07:30 in EDT).
- When EDT is 10.5 hours behind of IST: no shared 09:00 to 17:00 hours; try 18:00 in IST (07:30 in EDT).