Zone & HourIST to EST Time Converter
EST is 10 hours and 30 minutes behind of IST.
IST: India Standard Time, UTC+05:30.
EST: Eastern Standard Time, UTC−05:00.
For a city that changes clocks, use the date-aware city converter.
Check the abbreviation before converting
IST can also mean Irish Standard Time (UTC+01:00) or Israel Standard Time (UTC+02:00). This page always uses India.
Convert a time
9:00 AM IST = 10:30 PM EST (previous day)
24-hour IST to EST conversion table
These are fixed-offset examples. They apply whenever the two abbreviations have the exact meanings stated above.
| IST · UTC+05:30 | EST · UTC−05:00 | Day |
|---|---|---|
| 12:00 AM | 1:30 PM | Previous day |
| 1:00 AM | 2:30 PM | Previous day |
| 2:00 AM | 3:30 PM | Previous day |
| 3:00 AM | 4:30 PM | Previous day |
| 4:00 AM | 5:30 PM | Previous day |
| 5:00 AM | 6:30 PM | Previous day |
| 6:00 AM | 7:30 PM | Previous day |
| 7:00 AM | 8:30 PM | Previous day |
| 8:00 AM | 9:30 PM | Previous day |
| 9:00 AM | 10:30 PM | Previous day |
| 10:00 AM | 11:30 PM | Previous day |
| 11:00 AM | 12:30 AM | Same day |
| 12:00 PM | 1:30 AM | Same day |
| 1:00 PM | 2:30 AM | Same day |
| 2:00 PM | 3:30 AM | Same day |
| 3:00 PM | 4:30 AM | Same day |
| 4:00 PM | 5:30 AM | Same day |
| 5:00 PM | 6:30 AM | Same day |
| 6:00 PM | 7:30 AM | Same day |
| 7:00 PM | 8:30 AM | Same day |
| 8:00 PM | 9:30 AM | Same day |
| 9:00 PM | 10:30 AM | Same day |
| 10:00 PM | 11:30 AM | Same day |
| 11:00 PM | 12:30 PM | Same day |
What IST and EST mean
IST: India Standard Time
IST here means India Standard Time, UTC+05:30. India does not currently change clocks seasonally. A representative location is Kolkata / Mumbai, whose IANA identifier is Asia/Kolkata.
EST: Eastern Standard Time
EST means UTC−05:00. New York uses EDT (UTC−04:00) during daylight saving; choose the city converter for a date-aware result. A representative location is New York in winter, whose IANA identifier is America/New_York.
Common conversion examples
- 6:00 AM IST becomes 7:30 PM EST on the previous day.
- 9:00 AM IST becomes 10:30 PM EST on the previous day.
- 12:00 PM IST becomes 1:30 AM EST.
- 6:00 PM IST becomes 7:30 AM EST.
- 9:00 PM IST becomes 10:30 AM EST.
Frequently asked questions
Does this table change for daylight saving?
No. The offsets attached to these abbreviations stay fixed. A city may switch to a differently named abbreviation. IST is not a daylight-saving designation in the interpretation used here.
Should I put an abbreviation in a meeting invitation?
Use an IANA city time zone and a full date. Abbreviations are useful shorthand when everyone agrees on the meaning, but they do not carry the complete rules that a calendar needs for recurring events.
Why can the day change?
The difference is 630 minutes. Adding or subtracting that amount can move the destination time before midnight or beyond the end of the source day. The last column makes that change explicit.