How many hours ahead is Mumbai compared to New York?

Mumbai is either 9 hours 30 minutes or 10 hours 30 minutes ahead of New York. When New York observes EDT (UTC-4, roughly March–November), Mumbai (IST, UTC+5:30) is 9.5 hours ahead. When New York is on EST (UTC-5, roughly November–March), Mumbai is 10.5 hours ahead. Mumbai does not observe daylight saving time.

Does this tool account for daylight saving time?

Yes. The tool uses the browser's built-in Intl.DateTimeFormat API with the full IANA timezone identifiers (America/New_York and Asia/Kolkata), which automatically applies the correct DST offset for New York throughout the year. Mumbai stays on IST (UTC+5:30) year-round.

What time zone is Mumbai in?

Mumbai observes Indian Standard Time (IST), which is UTC+5:30. Unlike most major cities, India does not use daylight saving time, so IST is constant all year.

Why does Mumbai have a half-hour offset?

India chose UTC+5:30 when standardizing its time zone in 1947 to minimize disruption across the subcontinent. The 30-minute offset is intentional and has been in use ever since. This is why the New York–Mumbai difference is always a half-hour increment (9.5 h or 10.5 h).

What is the best overlap window for New York and Mumbai business hours?

Overlap is limited. When New York is on EDT, Mumbai business hours (9 AM–6 PM IST) correspond to roughly 11:30 PM–8:30 AM Eastern the day before. Practical synchronous windows are typically early morning New York / late evening Mumbai or via asynchronous collaboration.

Does the clock use my local computer time?

Yes, it reads your device's system clock and converts it to both timezones. If your device clock is accurate, both displayed times will be accurate.

Time Difference: New York to Mumbai

Name: Time Difference: New York to Mumbai
Availability: InStock
Author: Nham Vu

See the live current time in New York and Mumbai side by side, with the exact offset and a time converter updated every second.

New York

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EST / EDT

Mumbai

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IST (UTC+5:30)

Current Offset

Time Converter

New York time

Enter a New York time to convert

Mumbai time

Enter a Mumbai time to convert

Times shown are for the same calendar date. If the result crosses midnight, the actual date in the other city may differ by one day.

Overlapping Business Hours

New York window

Calculating...

Mumbai window

Calculating...

Standard overlap assumes Mumbai 9 AM–6 PM IST and New York 9 AM–6 PM ET working days.

Summary

See the live current time in New York and Mumbai side by side, with the exact offset and a time converter updated every second.

How it works

Your browser reads the current UTC timestamp every second.
It converts that timestamp into America/New_York local time using the Intl API.
It converts the same timestamp into Asia/Kolkata local time (IST, UTC+5:30).
Both clocks and the computed offset are rendered live on screen.
Enter any time in the converter panel to see the equivalent in the other city.
The offset adjusts automatically when New York switches between EST and EDT.

Use cases

Schedule a call or meeting between New York and Mumbai colleagues.
Check whether Mumbai business hours overlap with New York office hours.
Quickly confirm whether Mumbai is 9.5 or 10.5 hours ahead of New York today.
Convert a specific meeting time from one city to the other.
Help remote teams plan across the US–India time gap.
Verify the current EST or EDT offset versus IST.
Double-check a flight or train arrival time in the other city.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu