Time difference
Boston to Kolkata Time Difference
Kolkata is 9 hours and 30 minutes ahead of Boston — when it's 12:00 PM in Boston, it's 9:30 PM in Kolkata. (Boston (America/New_York, EDT); Kolkata (Asia/Kolkata, IST).) Below: live local times, the best hours for a call, a full conversion table, and exact daylight-saving dates.
Kolkata is 9 hours and 30 minutes ahead of Boston. Standard 9 AM–5 PM business hours in Boston and Kolkata do not overlap, so a live call needs one side outside normal hours. Clocks change on November 1, 2026, which briefly shifts the gap between Boston and Kolkata — the converter on this page always reflects the correct offset for the date you pick.
- When it's 9:00 AM in Boston, it's 6:30 PM in Kolkata.
- When it's 9:00 AM in Kolkata, it's 11:30 PM the previous day in Boston.
Kolkata is currently 9 hours and 30 minutes ahead of Boston.
Interactive converter
12:00PM
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Best times to meet
Standard 9 AM – 5 PM hours in Boston and Kolkata do not overlap. The least-bad options are an early start in one city or a late evening call in the other — for example a 7–8 AM meeting in Boston, or a 6–8 PM meeting in Kolkata.
Quick conversion table
| Boston | Kolkata |
|---|---|
| 12 AM | 9:30 AM |
| 1 AM | 10:30 AM |
| 2 AM | 11:30 AM |
| 3 AM | 12:30 PM |
| 4 AM | 1:30 PM |
| 5 AM | 2:30 PM |
| 6 AM | 3:30 PM |
| 7 AM | 4:30 PM |
| 8 AM | 5:30 PM |
| 9 AM | 6:30 PM |
| 10 AM | 7:30 PM |
| 11 AM | 8:30 PM |
| 12 PM | 9:30 PM |
| 1 PM | 10:30 PM |
| 2 PM | 11:30 PM |
| 3 PM | 12:30 AM (next day) |
| 4 PM | 1:30 AM (next day) |
| 5 PM | 2:30 AM (next day) |
| 6 PM | 3:30 AM (next day) |
| 7 PM | 4:30 AM (next day) |
| 8 PM | 5:30 AM (next day) |
| 9 PM | 6:30 AM (next day) |
| 10 PM | 7:30 AM (next day) |
| 11 PM | 8:30 AM (next day) |
Daylight saving
On November 1, 2026, Boston shifts for daylight saving. After that, Kolkata will be 10 hours and 30 minutes ahead of Boston (currently 9 hours and 30 minutes ahead of Boston). The converter and the tables above always reflect the correct offset for the date you pick.
- Boston is currently observing daylight saving time.
- Kolkata does not observe daylight saving time.
Frequently asked questions
- Is Kolkata ahead of or behind Boston?
- Kolkata is 9 hours and 30 minutes ahead of Boston.
- How many hours ahead of Boston is Kolkata?
- Kolkata is 9 hours and 30 minutes ahead of Boston.
- What time is 9 AM in Boston in Kolkata?
- 9:00 AM in Boston is 6:30 PM in Kolkata.
- What time is noon in Boston in Kolkata?
- 12:00 PM in Boston is 9:30 PM in Kolkata.
- What time is 5 PM in Boston in Kolkata?
- 5:00 PM in Boston is 2:30 AM the next day in Kolkata. Useful for end-of-day handoffs between the two offices.
- What time is 3 PM in Boston in Kolkata?
- 3:00 PM in Boston is 12:30 AM the next day in Kolkata.
- Is Boston currently observing daylight saving time?
- Boston is currently observing daylight saving time (summer time).
- Is Kolkata currently observing daylight saving time?
- Kolkata does not observe daylight saving time — its UTC offset stays the same all year.
- Do Boston and Kolkata observe daylight saving?
- On November 1, 2026, Boston shifts for daylight saving. After that, Kolkata will be 10 hours and 30 minutes ahead of Boston (currently 9 hours and 30 minutes ahead of Boston). The converter and the tables above always reflect the correct offset for the date you pick.
- When is the best time to call Kolkata from Boston?
- Boston and Kolkata business hours don't overlap. The closest options are early mornings in Boston or late evenings, when one side stretches outside 9–5.
- When is the best time to call Boston from Kolkata?
- Kolkata and Boston business hours don't overlap. The closest options are early mornings in Kolkata or late evenings, when one side stretches outside 9–5.
- Boston (EDT) to Kolkata (IST) — how do I convert quickly?
- Add 9 hours and 30 minutes to Boston local time to get Kolkata local time. Or use the converter at the top of this page — it stays accurate through daylight-saving changes automatically.
Other conversions
- Boston to New York
- Boston to London
- Boston to Tokyo
- Boston to Dubai
- Boston to Singapore
- Boston to Los Angeles
- Boston to Sydney
- Boston to Paris
- Boston to Mumbai
- Boston to Hong Kong