Scheduling a call between Mumbai and New York?
About this calculator
Scheduling a call between Mumbai and New York? Flying from London to Dubai and need landing time in local hours? This calculator converts any date and time from one IANA time zone to another and shows the hour gap between them.
Pick a source zone (default India IST), a target zone, and type the local date and time in the source zone. Results show formatted clock times in both places plus the signed hour difference. Offsets follow current daylight saving rules for each region.
Example: 30 May 2026 at 9:00 AM in Asia/Kolkata is late evening on 29 May in US Eastern during summer offset. The hour difference updates automatically when you change zones or the date.
Pair with the [[time]] calculator for adding hours to a clock, the [[date]] calculator for day counts, the [[hours]] calculator for duration math, and the [[countdown]] calculator when you need a timer to a future moment in another zone.
Common uses
- Video calls between India and US or UK offices
- Flight arrival time in local hours at the destination
- Cricket or IPL match start time for overseas viewers
- Setting reminders for global product launches or webinars
- Checking whether a bank wire cutoff falls on the same business day abroad
Frequently asked questions
How do I convert 3 PM IST to US Eastern time?
Set From to Asia/Kolkata, To to America/New_York, and enter your date with 15:00 as the time. The result shows the equivalent Eastern clock time and the hour offset, which shifts by one hour when US daylight saving is active.
Does the calculator handle daylight saving time?
Yes. Offsets come from the browser
What date format should I use?
Use ISO-style text: YYYY-MM-DDTHH:MM, for example 2026-05-30T09:00. The value is treated as local time in the source zone, not UTC. Invalid dates show a warning instead of a result.
Why is India only 9.5 hours ahead of US Eastern sometimes?
India (IST) stays UTC+5:30 year-round with no DST. US Eastern moves between UTC−5 and UTC−4. The gap is 9.5 hours in US summer and 10.5 hours in US winter — the calculator picks the right offset for your date.
Can I compare more than two zones at once?
This tool converts one source zone to one target zone per run. Switch the target zone and keep the same source time to compare several destinations, or use the [[time]] calculator for simple hour addition.