Convert IST to EST India Standard Time ↔ Eastern Standard Time Free Online Secure
Type a time in IST and read it in EST straight away. The offset is −10:30 h, the arithmetic wraps at midnight, and the answer says which day it lands on.
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Through the day — Convert IST to EST (India Standard Time ↔ Eastern Standard Time)
| IST | EST |
|---|---|
| 00:00 | 13:30 |
| 03:00 | 16:30 |
| 06:00 | 19:30 |
| 09:00 | 22:30 |
| 12:00 | 01:30 |
| 15:00 | 04:30 |
| 18:00 | 07:30 |
| 21:00 | 10:30 |
Where these units come from
Until the middle of the nineteenth century every town kept its own noon, set by the sun overhead, and nobody minded that the next town was four minutes behind. Railways ended that: a timetable cannot be written for a hundred local noons. Britain put its railways on Greenwich time in 1847, and in 1884 the International Meridian Conference in Washington chose Greenwich as the prime meridian and sketched the twenty-four-hour scheme we still use. Greenwich Mean Time was the world's reference until 1972, when Coordinated Universal Time replaced it: UTC is kept by atomic clocks and tied back to the turning Earth by leap seconds. The abbreviations on this page name standard time — the winter setting — which is why each one is a fixed number of hours rather than something that drifts through the year.
Where you meet them
A time zone becomes real the moment two people in different places have to agree on one moment: a call between offices, a flight that lands before it took off, a market that opens while you are asleep, a deadline written in somebody else's afternoon. Server logs, train and flight schedules and anything stamped with a time are kept in UTC precisely so that the question can always be settled, no matter whose clock was on the wall.
Questions people ask
What about summer time?
The offsets here are standard-time offsets, the ones a zone keeps in winter. Where summer time is observed, the same places move one hour further on for part of the year and take a different name: Central European Time becomes Central European Summer Time, Eastern Standard Time becomes Eastern Daylight Time. The switching dates are not the same in every country, and the two hemispheres change in opposite months, so for a date inside a summer-time period add an hour to whichever side observes it.
Why isn't every difference a whole number of hours?
Because offsets are decided by governments, not by geometry. India is half an hour off the hour, at UTC+05:30; Nepal is three quarters, at UTC+05:45; the Chatham Islands are at UTC+12:45. Any of these can be changed by law, and several countries have moved their offset within living memory.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
India’s clock, read in New York
The Republic Day parade starts at 10:30 IST. The prime minister’s speech at the Red Fort on 15 August begins at 07:30. A cricket match is scheduled for 19:30. Anyone with relatives, friends or clients in the United States wonders what time it is for them at those moments, and the answer comes from a “convert IST to EST” calculation. In the cold season the rule is one line: subtract ten and a half hours. 19:30 IST becomes 09:00 EST, 10:30 IST becomes 00:00 EST, and 07:30 IST becomes 21:00 EST on the previous day. Any Indian time before 10:30 belongs to the previous day in the east. While America is on summer time, from 8 March to 31 October, the difference shrinks to nine and a half hours.
The page starts from the Indian events followed in America, then gives the rule, the tables and a description of the two zones. The arithmetic runs in your browser; no figure reaches a server.
Republic Day in the American night
The Delhi parade
The 26 January parade starts at 10:30 IST, which is 00:00 EST, midnight between 25 and 26 January on the East Coast. Americans watch it live in the middle of the night or in a repeat in the morning.
The broadcasts
The afternoon broadcast, at 15:00 IST, is at 4:30 a.m. EST. A “convert IST to EST” calculation tells you at once whether the moment will be hard to catch.
15 August at the Red Fort
The flag and the speech
The Independence Day ceremony begins at 07:30 IST, which is 10:00 p.m. EDT on the previous evening, because in August America is on summer time and the gap is nine and a half hours. The Indian community in the east watches after dinner.
The evening of the holiday
Cultural programmes in the evening, from 19:30 IST, are at 10:00 a.m. EDT. For the east it is a working morning.
The cricket league
The evening match
League matches begin at 19:30 IST, which is 10:00 a.m. EDT in April and May, when America is on summer time. Fans in New York watch during the morning break at the office.
The final
The final is also played in the evening. If it starts in Mumbai at 19:30, it starts in New York at 10:00 in the morning, and a fan who has done a “convert IST to EST” calculation takes the day off for it.
The big engineering entrance examination
The morning session
A paper from 09:00 to 12:00 IST runs, on the Eastern clock, from 22:30 to 01:30. Parents in America waiting for news watch the screen at night.
The afternoon session
The paper from 15:00 to 18:00 IST is from 4:30 a.m. to 7:30 a.m. EST. Results usually appear early in the Indian morning, which is the American night.
The budget speech
Presentation in Parliament
The finance minister presents the budget at 11:00 IST, which is 00:30 EST. American analysts comment on it in the morning, having gone to bed with the latest figures.
The market’s reaction
The Mumbai exchange reacts in that very session, which ends at 15:30 IST, or 5:00 a.m. EST, four and a half hours before the American market opens.
The Mumbai exchange and Wall Street
The two timetables
The Indian exchange trades from 09:15 to 15:30 IST, which is 22:45 on the previous day to 05:00 EST. Wall Street trades from 9:30 a.m. to 4:00 p.m. EST. The two sessions never overlap.
How to read it
A “convert IST to EST” calculation for each line of the timetable shows that between the Mumbai close and the New York open there are 4 hours and 30 minutes, a window in which news can move both markets.
Hindi film releases
The evening premiere
A premiere scheduled for 18:00 IST begins at 7:30 a.m. EST. Fans in the diaspora watch online on the way to work.
The online release
A film released on a platform at 00:00 IST appears at 1:30 p.m. EST on the previous day. Americans can therefore see it before Indians do.
International Yoga Day
The morning session
The main session, at 07:00 IST on 21 June, is at 9:30 p.m. EDT on 20 June. Practitioners in America join in the evening, after work.
Local events
Classes in New York parks start at 9:00 a.m. EDT, which is 18:30 IST. A “convert IST to EST” calculation made in advance shows which session suits your hour.
Launches from Sriharikota
The launch window
A launch scheduled for 09:30 IST is a launch at 11:00 p.m. EST on the previous day. American engineers usually follow the official broadcast.
The probe’s landing
A final manoeuvre at 18:00 IST takes place at 7:30 a.m. EST. Whoever does a “convert IST to EST” calculation for each stage of the mission knows when to open the stream.
How to convert IST to EST, step by step
Subtract ten and a half hours
IST is UTC+5:30 and EST is UTC−5. The American Eastern clock is ten and a half hours behind the Indian one. Subtract 10 hours 30 minutes from the Indian time. If the result is negative, add 24 and go to the previous date.
Eight pairs
03:30 IST is 17:00 EST the day before. 07:30 IST is 21:00 EST the day before. 10:30 IST is 00:00 EST. 12:00 IST is 01:30 EST. 15:30 IST is 05:00 EST. 19:30 IST is 09:00 EST. 22:45 IST is 12:15 EST. 23:59 IST is 13:29 EST. The first two cross into the previous date.
The American summer
From 8 March until 31 October, EDT against IST is nine and a half hours: 19:30 IST is 10:00 EDT. India does not change its clock, so the gap changes only when America moves its own.
The American eastern zone
Where it applies
In winter UTC−5 is the clock of New York, Boston, Washington, Atlanta, Miami, Toronto and Montreal. In spring it moves to UTC−4 under the name EDT. American texts write “ET”.
Why it matters to you
Everything scheduled nationally in the United States uses Eastern time. An Indian reader who wants to catch a live broadcast therefore often has to convert IST to EST.
Indian Standard Time
A single zone
The whole country uses UTC+5:30 and never moves to summer time. Because of the half hour, the minutes in the answer change: 19:15 IST becomes 08:45 EST.
The neighbours
Sri Lanka keeps the same time as India. Nepal is on UTC+5:45, Pakistan on UTC+5 and Bangladesh on UTC+6.
Ten and a half hours between dials
The working day
An office day in Delhi from 09:00 to 17:00 reads 22:30 to 06:30 on the Eastern dial, while an office day in Chicago or New York from 09:00 to 17:00 reads 19:30 to 03:30 in India. Standard working hours touch nowhere, so joint teams organise themselves in shifts.
Who rings first
A call from India at 19:00 IST reaches New York at 8:30 a.m. EST, at the start of the day. A call at 11:00 IST reaches 00:30 EST, in the middle of the night.
Across the ocean
An aircraft that departs from Delhi at 02:00 IST and flies for nearly fifteen hours touches down at 17:00 IST, which is 06:30 EST. The ticket says 02:00 and 06:30, as though the trip took four and a half hours.
Teams working in shifts
The evening shift
A support centre in India serving American customers starts its shift at 18:00 IST, which is 7:30 a.m. EST. The first hour is quiet, then the phones ring until 02:30 IST.
Who takes the baton
At 02:30 IST, which is 4:00 p.m. EST, the shift ends and the American colleagues take over the open cases. Anyone who does a “convert IST to EST” calculation at each handover sees why written documentation is a must.
The same Indian hour, four moments of the year
January
On Monday 19 January, an event announced for 20:00 IST takes place at 09:30 EST. The winter difference of ten and a half hours applies.
Early March
On Monday 2 March, 20:00 IST still means 09:30 EST, because America has not yet moved its clock.
Mid-March
On Monday 16 March, 20:00 IST means 10:30 EDT. The Americans advanced their clocks on 8 March and the Indians did not, so the difference is now nine and a half hours.
July and November
On Monday 20 July, 10:30 EDT still stands for 20:00 IST. On Monday 2 November, the Indian 20:00 reads 09:30 EST again, because the American clock returned to standard time on 1 November.
Diwali in two countries
The evening of lights
The main prayer on Diwali evening takes place at 19:00 IST, which is 8:30 a.m. EST or 9:30 a.m. EDT, depending on the date. Communities in America celebrate in the morning or the evening, according to their own schedule.
The fireworks
Fireworks at midnight, at 00:00 IST, are at 1:30 p.m. EST on the previous day. A “convert IST to EST” calculation tells you from what hour you can watch the broadcast.
World clocks, counted from Delhi
How many hours to add or subtract
Starting from Indian time, subtract four and a half hours for Berlin and five and a half for London, both in winter time. Subtract ten and a half for New York and thirteen and a half for Los Angeles. Add three and a half hours for Tokyo.
An example for invitations
When it is 20:00 in Delhi, it is 14:30 in London, 15:30 in Berlin, 9:30 in New York and 23:30 in Tokyo. An invitation with all the hours beside it spares the recipient a “convert IST to EST” calculation of their own.
Online courses with Indian institutions
Lecture times
A lecture at 18:00 IST is at 7:30 a.m. EST. American students follow it in the morning, before class.
Deadlines
A deadline of 23:59 IST falls at 1:29 p.m. EST on the same day. Whoever thinks they have until midnight on their own clock loses whole hours. A “convert IST to EST” calculation made with the date in view avoids the mistake.
The weeks and months that need care
The 2026 calendar
The difference between IST and EST depends on the date. In 2026: 1 January to 7 March and 1 November to 31 December — EST runs 10 hours 30 minutes behind IST; 8 to 28 March, 29 March to 24 October and 25 to 31 October — EST runs 9 hours 30 minutes behind IST.
What to do about it
During the summer periods the zones are called IST and EDT. The calculator assumes the winter gap of 10 hours 30 minutes; adjust by the difference shown for your date. Before you convert IST to EST, find the period that contains your date.
A day of conversions at a glance
IST into EST
00:00 IST becomes 13:30 EST (previous day). 01:00 IST becomes 14:30 EST (previous day). 02:00 IST becomes 15:30 EST (previous day). 03:00 IST becomes 16:30 EST (previous day). 04:00 IST becomes 17:30 EST (previous day). 05:00 IST becomes 18:30 EST (previous day). 06:00 IST becomes 19:30 EST (previous day). 07:00 IST becomes 20:30 EST (previous day). 08:00 IST becomes 21:30 EST (previous day). 09:00 IST becomes 22:30 EST (previous day). 10:00 IST becomes 23:30 EST (previous day). 11:00 IST becomes 00:30 EST. 12:00 IST becomes 01:30 EST. 13:00 IST becomes 02:30 EST. 14:00 IST becomes 03:30 EST. 15:00 IST becomes 04:30 EST. 16:00 IST becomes 05:30 EST. 17:00 IST becomes 06:30 EST. 18:00 IST becomes 07:30 EST. 19:00 IST becomes 08:30 EST. 20:00 IST becomes 09:30 EST. 21:00 IST becomes 10:30 EST. 22:00 IST becomes 11:30 EST. 23:00 IST becomes 12:30 EST.
Using the table
Find the IST hour you need and read off the EST hour beside it. The rows come from the arithmetic behind each request to convert IST to EST. This pair has a half-hour in its offset, so every :00 becomes :30, every :15 becomes :45 and so on, with the hour carried over. Winter-time arithmetic applies to these rows; for the dates in the period section, correct the result accordingly.
Half-hour conversions
IST half-hours in EST
00:30 IST becomes 14:00 EST (previous day). 01:30 IST becomes 15:00 EST (previous day). 02:30 IST becomes 16:00 EST (previous day). 03:30 IST becomes 17:00 EST (previous day). 04:30 IST becomes 18:00 EST (previous day). 05:30 IST becomes 19:00 EST (previous day). 06:30 IST becomes 20:00 EST (previous day). 07:30 IST becomes 21:00 EST (previous day). 08:30 IST becomes 22:00 EST (previous day). 09:30 IST becomes 23:00 EST (previous day). 10:30 IST becomes 00:00 EST. 11:30 IST becomes 01:00 EST. 12:30 IST becomes 02:00 EST. 13:30 IST becomes 03:00 EST. 14:30 IST becomes 04:00 EST. 15:30 IST becomes 05:00 EST. 16:30 IST becomes 06:00 EST. 17:30 IST becomes 07:00 EST. 18:30 IST becomes 08:00 EST. 19:30 IST becomes 09:00 EST. 20:30 IST becomes 10:00 EST. 21:30 IST becomes 11:00 EST. 22:30 IST becomes 12:00 EST. 23:30 IST becomes 13:00 EST.
What to remember
Half-hour starts are as easy to convert as whole hours. The rows below are the result of the same rule you use when you convert IST to EST. Winter-time arithmetic applies to these rows; for the dates in the period section, correct the result accordingly.
Ten readings with minutes
Examples from IST to EST
01:05 IST becomes 14:35 EST (previous day). 03:20 IST becomes 16:50 EST (previous day). 05:50 IST becomes 19:20 EST (previous day). 07:35 IST becomes 21:05 EST (previous day). 10:10 IST becomes 23:40 EST (previous day). 13:25 IST becomes 02:55 EST. 16:40 IST becomes 06:10 EST. 19:55 IST becomes 09:25 EST. 22:15 IST becomes 11:45 EST. 23:05 IST becomes 12:35 EST.
What to notice
These are less round examples, with minutes. Watch the minutes: a thirty-minute difference means :00 and :30 swap places and the hour is adjusted accordingly. Read these rows as standard-time values and check the period section for dates where the difference changes.
Times of day in EST
A day in IST, translated into EST
06:00 IST becomes 19:30 EST (evening). 08:00 IST becomes 21:30 EST (evening). 10:00 IST becomes 23:30 EST (night). 12:00 IST becomes 01:30 EST (night). 14:00 IST becomes 03:30 EST (night). 16:00 IST becomes 05:30 EST (early morning). 18:00 IST becomes 07:30 EST (early morning). 20:00 IST becomes 09:30 EST (morning). 22:00 IST becomes 11:30 EST (morning).
A practical tip
Read down the list to see how the IST day maps onto the EST day. It is useful before you convert IST to EST for a meeting invitation. These rows use the standard (winter) gap; on the dates listed in the period section the gap is different.
A quick routine to convert IST to EST
First
Confirm the zones
Take care: IST may refer to Ireland or Israel as well, but here it is Indian Standard Time. Eastern Standard Time is UTC−5; Australia uses the letters EST too, at UTC+10, which this page does not cover.
Use a 24-hour clock
Write 4:30 p.m. as 16:30 and 12:00 a.m. as 00:00 before you start. For example, 09:15 IST becomes 22:45 EST (previous day).
Finishing
The operation
Subtract 10 hours 30 minutes. If the result passes midnight, correct the date: readings before 10:30 fall on the previous date.
A second example
Late in the evening, 22:40 IST becomes 12:10 EST.
Mistakes when you convert IST to EST
Adding instead of subtracting
Because EST runs behind IST, the result must be an earlier clock reading. A later one points to an addition.
Losing the date
IST readings before 10:30 fall on the previous date. If the date stays put, the answer is a full day out.
The standard figure in the wrong weeks
The gap between IST and EST is not the same on every date in 2026. Check the period list above before you rely on the standard figure.
Confusing the abbreviation
Take care: IST may refer to Ireland or Israel as well, but here it is Indian Standard Time. Eastern Standard Time is UTC−5; Australia uses the letters EST too, at UTC+10, which this page does not cover.
Quick answers
By how much do IST and EST differ?
10 hours 30 minutes, and EST is behind IST. That is the standard figure; on some dates in 2026 it differs, as the period list shows.
What do I do to convert IST to EST?
Subtract 10 hours 30 minutes from the IST time, then fix the date if the result passes midnight.
How much is 21:45 IST in EST?
11:15 EST in the standard period.
Does the answer change during the year?
Yes, on some dates; the period list above shows which.
Does the page keep what I type?
No. Nothing leaves the page.
Where to go next
Related pages: Convert IST to CET, Convert IST to PST, Convert GMT to EST, Convert CST to EST, Convert EST to CST, Convert CET to IST, Convert CET to CST, Convert GMT to CET, Convert UTC to EST. For the reverse direction, open Convert EST to IST.
The short version: subtract 10 hours 30 minutes, check the date, and you can convert IST to EST with confidence. No account is needed.