Offset
The time difference between Eastern Time and Kolkata is 9.5 hours.
Eastern Time (EDT) is behind Kolkata (IST).
EDT: UTC-4
IST: UTC+5:30
Eastern Time is currently observing daylight saving time; Kolkata is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Eastern Time and Kolkata don't overlap on the same weekday. Kolkata is 10 hours ahead of Eastern Time.
With some flexibility, there’s a workable window outside standard hours:
- 7 AM–11 AM in Eastern Time (4 PM–8 PM in Kolkata) — suggest 9:00 AM Eastern Time (6:30 PM Kolkata).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
About these zones
Eastern Time is also known as EST, or EDT. To call United States, dial +1.
Kolkata uses India Standard Time (IST). To call India, dial +91.
Kolkata is approximately 7,900 miles north of Eastern Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| EST | Kolkata | Day |
|---|---|---|
| 12:00 am | 9:30 am | Same day |
| 1:00 am | 10:30 am | Same day |
| 2:00 am | 11:30 am | Same day |
| 3:00 am | 12:30 pm | Same day |
| 4:00 am | 1:30 pm | Same day |
| 5:00 am | 2:30 pm | Same day |
| 6:00 am | 3:30 pm | Same day |
| 7:00 am | 4:30 pm | Same day |
| 8:00 am | 5:30 pm | Same day |
| 9:00 am | 6:30 pm | Same day |
| 10:00 am | 7:30 pm | Same day |
| 11:00 am | 8:30 pm | Same day |
| 12:00 pm | 9:30 pm | Same day |
| 1:00 pm | 10:30 pm | Same day |
| 2:00 pm | 11:30 pm | Same day |
| 3:00 pm | 12:30 am | +1 day |
| 4:00 pm | 1:30 am | +1 day |
| 5:00 pm | 2:30 am | +1 day |
| 6:00 pm | 3:30 am | +1 day |
| 7:00 pm | 4:30 am | +1 day |
| 8:00 pm | 5:30 am | +1 day |
| 9:00 pm | 6:30 am | +1 day |
| 10:00 pm | 7:30 am | +1 day |
| 11:00 pm | 8:30 am | +1 day |
Daylight saving time
Eastern Time observes daylight saving time; Kolkata does not. The offset between the two zones changes when Eastern Time transitions: on Sunday, November 1, 2026, clocks fall back from EDT to EST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:26 AM
- Sunset
- 8:26 PM
- Day length
- 15h
- Sunrise
- 4:52 AM
- Sunset
- 6:21 PM
- Day length
- 13h 28m
Daylight overlap: 3h 25m — 5:26 AM–8:51 AM in Eastern Time (2:56 PM–6:21 PM in Kolkata). Both locations are in daylight during this window.
Cities in these zones
Cities in Eastern Time
Other cities in India Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Eastern Time
- EWR
- HPN
- JFK
- LGA
- TEB
- ILG
- PHL
- TTN
- CLT
- USA
Airports in India Standard Time
- BOM
- NMI
- DEL
- BLR
- HYD
- AMD
- MAA
- CCU
- STV
- PNQ
Related conversions
Common conversions
- What is 9:00 am EST in Kolkata?
- 9:00 am EST is 6:30 pm Kolkata.
- What is 12:00 pm EST in Kolkata?
- 12:00 pm EST is 9:30 pm Kolkata.
- What is 12:30 pm EST in Kolkata?
- 12:30 pm EST is 10:00 pm Kolkata.
- What is 2:00 pm EST in Kolkata?
- 2:00 pm EST is 11:30 pm Kolkata.
- What is 5:00 pm EST in Kolkata?
- 5:00 pm EST is 2:30 am Kolkata, the next day.
- What is 11:30 pm EST in Kolkata?
- 11:30 pm EST is 9:00 am Kolkata, the next day.