Convert EDT to IRST
IRST is 7 hours 30 minutes ahead of EDT. EDT is UTC−4 and IRST is UTC+3:30.
Right now: EDT · IRST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 1 hour: 9:00 AM–10:00 AM EDT (4:00 PM–5:00 PM IRST). Schedule meetings inside that window.
| EDT | IRST | Suitable? |
|---|---|---|
| 9:00 AM | 4:30 PM | working hours |
| 10:00 AM | 5:30 PM | outside 9–5 |
| 11:00 AM | 6:30 PM | outside 9–5 |
| 12:00 PM | 7:30 PM | outside 9–5 |
| 1:00 PM | 8:30 PM | outside 9–5 |
| 2:00 PM | 9:30 PM | outside 9–5 |
| 3:00 PM | 10:30 PM | outside 9–5 |
| 4:00 PM | 11:30 PM | outside 9–5 |
| 5:00 PM | 12:30 AM (next day) | outside 9–5 |
EDT to IRST conversion table
| EDT | IRST |
|---|---|
| 12:00 AM | 7:30 AM |
| 1:00 AM | 8:30 AM |
| 2:00 AM | 9:30 AM |
| 3:00 AM | 10:30 AM |
| 4:00 AM | 11:30 AM |
| 5:00 AM | 12:30 PM |
| 6:00 AM | 1:30 PM |
| 7:00 AM | 2:30 PM |
| 8:00 AM | 3:30 PM |
| 9:00 AM | 4:30 PM |
| 10:00 AM | 5:30 PM |
| 11:00 AM | 6:30 PM |
| 12:00 PM | 7:30 PM |
| 1:00 PM | 8:30 PM |
| 2:00 PM | 9:30 PM |
| 3:00 PM | 10:30 PM |
| 4:00 PM | 11:30 PM |
| 5:00 PM | 12:30 AM (next day) |
| 6:00 PM | 1:30 AM (next day) |
| 7:00 PM | 2:30 AM (next day) |
| 8:00 PM | 3:30 AM (next day) |
| 9:00 PM | 4:30 AM (next day) |
| 10:00 PM | 5:30 AM (next day) |
| 11:00 PM | 6:30 AM (next day) |
About EDT
Eastern Daylight Time (EDT) is UTC−4. It is used in New York, Toronto, Miami and Atlanta from March to November.
Eastern Daylight Time is UTC−4, the summer clock for New York, Toronto, Miami and Atlanta, running from the second Sunday in March to the first Sunday in November. Those dates are US law and do not match Europe's, which changes on the last Sundays of March and October — so for two weeks in March and one in late October the gap between New York and London is an hour different from its usual five.
About IRST
Iran Standard Time (IRST) is UTC+3:30. It is used in Iran, all year.
Iran Standard Time is UTC+3:30. Iran ran daylight saving for decades and stopped in 2022, so material written before then puts the country half an hour further ahead in summer and is now wrong. Half-hour offsets are rare enough that scheduling tools sometimes round them, which turns a correct calculation into a thirty-minute error.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on EDT switches to EST (UTC−5) from November to March. So the 7.5-hour figure on this page is correct for the part of the year when both places are actually on these abbreviations, and changes by an hour outside it.
IRST does not shift, so the whole change comes from one side. A recurring meeting fixed in IRST will appear to move by an hour for everyone on the other side, twice a year, without anyone changing anything.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM EDT in IRST?
9:00 AM EDT is 4:30 PM IRST.
Is IRST ahead of EDT?
IRST is 7 hours 30 minutes ahead of EDT.
Which time zone does this use?
EDT is UTC−4 and IRST is UTC+3:30. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.