Mumbai is 9 hours 30 minutes ahead of New York. Put the other way round: New York is 9 hours 30 minutes behind Mumbai.
New York is UTC-4 in summer and UTC-5 in winter; Mumbai is UTC+5:30 and UTC+5:30.
A nine-to-five in New York and a nine-to-five in Mumbai do not overlap at all. Somebody has to move: the nearest workable slots are early morning in one city or late evening in the other, which is the kind of thing the planner is for.
New York changes its clocks for summer and Mumbai does not, so there is no single answer: the gap is 9 hours 30 minutes for the northern summer and 10 hours 30 minutes for the rest of the year.
| New York | Mumbai |
|---|---|
| 08:00 | 17:30 |
| 09:00 | 18:30 |
| 10:00 | 19:30 |
| 11:00 | 20:30 |
| 12:00 | 21:30 |
| 13:00 | 22:30 |
| 14:00 | 23:30 |
| 15:00 | 00:30 next day |
| 16:00 | 01:30 next day |
| 17:00 | 02:30 next day |
| 18:00 | 03:30 next day |
This page covers one pair. TimeGap takes a list: add every city you care about, drag one marker, and every row reads the same instant on its own clock. It marks the hours you would actually take a call, finds the window where the most people are reachable, flags public holidays, and puts the time you pick straight into Outlook or Google Calendar.