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