IST to EST converter
EST is 10 hours 30 minutes behind IST. IST never moves and EST does, so this gap is not the same number all year. The full hour-by-hour table is below, and it reads perfectly well with JavaScript turned off. No account, no email address.
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IST to EST, hour by hour
Shaded rows are inside a nine-to-five working day in both Mumbai and New York.
| IST | EST |
|---|---|
| 6:00am | 7:30pm day before |
| 7:00am | 8:30pm day before |
| 8:00am | 9:30pm day before |
| 9:00am | 10:30pm day before |
| 10:00am | 11:30pm day before |
| 11:00am | 12:30am |
| 12:00pm | 1:30am |
| 1:00pm | 2:30am |
| 2:00pm | 3:30am |
| 3:00pm | 4:30am |
| 4:00pm | 5:30am |
| 5:00pm | 6:30am |
| 6:00pm | 7:30am |
| 7:00pm | 8:30am |
| 8:00pm | 9:30am |
| 9:00pm | 10:30am |
| 10:00pm | 11:30am |
IST to EST is not the same gap all year
IST never moves and EST does, so this gap is not the same number all year. IST is all of India and Sri Lanka, with no daylight saving at all. It has no summer form at all. The US side changes on the second Sunday in March and back on the first Sunday in November. Between those two Sundays the real difference is one hour less than the 10 hours 30 minutes behind this page is named for.
Strictly, EST is the winter clock. In July those cities are on EDT (Eastern Daylight Time), one hour ahead of EST, and hardly anyone says so out loud. That one hour is the single most common conversion mistake there is, and it is why a July call booked from a January table arrives an hour late.
IST and EST
- Same all year
- No, one hour less for part of the year
- Shared office hours
- None between 9 and 5
Booking a call between Mumbai and New York
There is no overlap in a nine-to-five day. At 10 hours 30 minutes apart, one side is always outside working hours while the other is in them. Somebody takes an early morning or a late evening. The useful thing is to decide which, once, rather than rediscovering it every week.
When it is 9:00am in Mumbai it is 10:30pm the previous day in New York. When New York opens at 9:00am, Mumbai reads 7:30pm.
IST covers all of India and Sri Lanka, with no daylight saving at all: Mumbai, Delhi, Bengaluru, Chennai, Colombo. EST covers the US east coast and eastern Canada: New York, Toronto, Atlanta, Miami, Boston.
IST to EST: common questions
What time is it in EST when it is 9am IST?
10:30pm the day before. EST is 10 hours 30 minutes behind IST. The table above runs the same conversion for every hour of the day.
Why is my IST to EST conversion off by an hour?
Because of daylight saving. IST never moves and EST does, so this gap is not the same number all year. IST is all of India and Sri Lanka, with no daylight saving at all. It has no summer form at all. The US side changes on the second Sunday in March and back on the first Sunday in November. Between those two Sundays the real difference is one hour less than the 10 hours 30 minutes behind this page is named for. If a conversion looks an hour out, check which side of a clock change the date falls on.
Why does IST to EST show tomorrow’s date?
Because the gap is large enough to cross midnight. EST is 10 hours 30 minutes behind IST, so an evening in IST is already the next morning in EST. It is not an error. The date genuinely differs while both clocks are running normally.
When can IST and EST actually meet?
There is no overlap in a nine-to-five day: the difference is 10 hours 30 minutes behind, which puts one side outside working hours whenever the other is in them. Somebody has to take an early morning or a late evening, so it is worth deciding which end that is rather than rediscovering it every week.
Is this IST to EST converter free?
Yes, completely. No account, no email address, no trial. The table works with JavaScript turned off and nothing you type is sent anywhere.
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