EST to Kolkata time conversion
Kolkata is 10 hours 30 minutes ahead of EST.
EST is always UTC-5. Right now most places that use EST are on EDT (UTC-4): Kolkata is 9 hours 30 minutes ahead of EDT.
Time difference with your location
EST is 5 hours behind UTC. Compare with your local time →
Choose a date and time
Choose the local time in EST to convert it to Kolkata on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · EST → Kolkata
This table converts each hour in EST to Kolkata on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| EST | Kolkata | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 10:3010:30 AM | |
| 01:001:00 AM | 11:3011:30 AM | |
| 02:002:00 AM | 12:3012:30 PM | |
| 03:003:00 AM | 13:301:30 PM | |
| 04:004:00 AM | 14:302:30 PM | |
| 05:005:00 AM | 15:303:30 PM | |
| 06:006:00 AM | 16:304:30 PM | |
| 07:007:00 AM | 17:305:30 PM | |
| 08:008:00 AM | 18:306:30 PM | |
| 09:009:00 AM | 19:307:30 PM | |
| 10:0010:00 AM | 20:308:30 PM | |
| 11:0011:00 AM | 21:309:30 PM | |
| 12:0012:00 PM | 22:3010:30 PM | |
| 13:001:00 PM | 23:3011:30 PM | |
| 14:002:00 PM | 00:3012:30 AM +1 day | |
| 15:003:00 PM | 01:301:30 AM +1 day | |
| 16:004:00 PM | 02:302:30 AM +1 day | |
| 17:005:00 PM | 03:303:30 AM +1 day | |
| 18:006:00 PM | 04:304:30 AM +1 day | |
| 19:007:00 PM | 05:305:30 AM +1 day | |
| 20:008:00 PM | 06:306:30 AM +1 day | |
| 21:009:00 PM | 07:307:30 AM +1 day | |
| 22:0010:00 PM | 08:308:30 AM +1 day | |
| 23:0011:00 PM | 09:309:30 AM +1 day |
Quick conversion examples
These examples use EST (UTC-5) and Kolkata (UTC+5:30); choosing a date applies the local clock changes.
Conversion formula: Kolkata = EST + 10h30 · EDT + 9h30.
| EST | Kolkata |
|---|---|
| 6:00 AM EST | = 4:30 PM Kolkata |
| 7:00 AM EST | = 5:30 PM Kolkata |
| 8:00 AM EST | = 6:30 PM Kolkata |
| 9:00 AM EST | = 7:30 PM Kolkata |
| 10:00 AM EST | = 8:30 PM Kolkata |
| 12:00 PM EST | = 10:30 PM Kolkata |
| 3:00 PM EST | = 1:30 AM Kolkata (+1 day) |
| 5:00 PM EST | = 3:30 AM Kolkata (+1 day) |
| 6:00 PM EST | = 4:30 AM Kolkata (+1 day) |
| 8:00 PM EST | = 6:30 AM Kolkata (+1 day) |
Overlapping meeting hours
The 08:00–18:00 working days in EST and Kolkata do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
EST and Kolkata have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | EST | Kolkata |
|---|---|---|
| 2026 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+5:30 all year. |
| 2027 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+5:30 all year. |
| 2028 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+5:30 all year. |
At the start of 2026, Kolkata is 10 hours 30 minutes ahead of EST. The difference changes during the following periods.
- From 2026-03-08 03:00 EDT until 2026-11-01 01:00 EST, Kolkata is 9 hours 30 minutes ahead of EDT.
- From 2027-03-14 03:00 EDT until 2027-11-07 01:00 EST, Kolkata is 9 hours 30 minutes ahead of EDT.
- From 2028-03-12 03:00 EDT until 2028-11-05 01:00 EST, Kolkata is 9 hours 30 minutes ahead of EDT.
Frequently asked questions
What time is 9 AM EST in Kolkata?
9:00 AM EST = 7:30 PM Kolkata, using UTC-5 and UTC+5:30. Choose a date above for the seasonal local time.
Does the time difference between EST and Kolkata change during the year?
Yes. During 2026–2028: Kolkata is 9 hours 30 minutes ahead of EST; Kolkata is 10 hours 30 minutes ahead of EST. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in Kolkata?
Read the Kolkata clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between EST and Kolkata?
The 08:00–18:00 working days in EST and Kolkata do not overlap.
What is the time difference between EST and Kolkata now?
Right now, Kolkata is 10 hours 30 minutes ahead of EST. Conversion formula: Kolkata = EST + 10h30 · EDT + 9h30.