EST to IST converter
IST is 10 hours 30 minutes ahead of EST. 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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EST to IST, hour by hour
Shaded rows are inside a nine-to-five working day in both New York and Mumbai.
| EST | IST |
|---|---|
| 6:00am | 4:30pm |
| 7:00am | 5:30pm |
| 8:00am | 6:30pm |
| 9:00am | 7:30pm |
| 10:00am | 8:30pm |
| 11:00am | 9:30pm |
| 12:00pm | 10:30pm |
| 1:00pm | 11:30pm |
| 2:00pm | 12:30am next day |
| 3:00pm | 1:30am next day |
| 4:00pm | 2:30am next day |
| 5:00pm | 3:30am next day |
| 6:00pm | 4:30am next day |
| 7:00pm | 5:30am next day |
| 8:00pm | 6:30am next day |
| 9:00pm | 7:30am next day |
| 10:00pm | 8:30am next day |
EST to IST 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, so 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 ahead 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.
EST and IST
- Same all year
- No, one hour less for part of the year
- Shared office hours
- None between 9 and 5
Booking a call between New York and Mumbai
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 New York it is 7:30pm in Mumbai. When Mumbai opens at 9:00am, New York reads 10:30pm the previous day.
EST covers the US east coast and eastern Canada: New York, Toronto, Atlanta, Miami, Boston. IST covers all of India and Sri Lanka, with no daylight saving at all: Mumbai, Delhi, Bengaluru, Chennai, Colombo.
EST to IST: common questions
What time is it in IST when it is 9am EST?
7:30pm. IST is 10 hours 30 minutes ahead of EST. The table above runs the same conversion for every hour of the day.
Why is my EST to IST 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, so 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 ahead 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 EST to IST show tomorrow’s date?
Because the gap is large enough to cross midnight. IST is 10 hours 30 minutes ahead of EST, so an evening in EST is already the next morning in IST. It is not an error. The date genuinely differs while both clocks are running normally.
When can EST and IST actually meet?
There is no overlap in a nine-to-five day: the difference is 10 hours 30 minutes ahead, 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 EST to IST 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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