Convert IRST to EEST
EEST is 30 minutes behind IRST. IRST is UTC+3:30 and EEST is UTC+3.
Right now: IRST · EEST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 7 hours: 10:00 AM–5:00 PM IRST (9:00 AM–4:00 PM EEST). Schedule meetings inside that window.
| IRST | EEST | Suitable? |
|---|---|---|
| 9:00 AM | 8:30 AM | outside 9–5 |
| 10:00 AM | 9:30 AM | working hours |
| 11:00 AM | 10:30 AM | working hours |
| 12:00 PM | 11:30 AM | working hours |
| 1:00 PM | 12:30 PM | working hours |
| 2:00 PM | 1:30 PM | working hours |
| 3:00 PM | 2:30 PM | working hours |
| 4:00 PM | 3:30 PM | working hours |
| 5:00 PM | 4:30 PM | working hours |
IRST to EEST conversion table
| IRST | EEST |
|---|---|
| 12:00 AM | 11:30 PM (previous day) |
| 1:00 AM | 12:30 AM |
| 2:00 AM | 1:30 AM |
| 3:00 AM | 2:30 AM |
| 4:00 AM | 3:30 AM |
| 5:00 AM | 4:30 AM |
| 6:00 AM | 5:30 AM |
| 7:00 AM | 6:30 AM |
| 8:00 AM | 7:30 AM |
| 9:00 AM | 8:30 AM |
| 10:00 AM | 9:30 AM |
| 11:00 AM | 10:30 AM |
| 12:00 PM | 11:30 AM |
| 1:00 PM | 12:30 PM |
| 2:00 PM | 1:30 PM |
| 3:00 PM | 2:30 PM |
| 4:00 PM | 3:30 PM |
| 5:00 PM | 4:30 PM |
| 6:00 PM | 5:30 PM |
| 7:00 PM | 6:30 PM |
| 8:00 PM | 7:30 PM |
| 9:00 PM | 8:30 PM |
| 10:00 PM | 9:30 PM |
| 11:00 PM | 10:30 PM |
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.
About EEST
Eastern European Summer Time (EEST) is UTC+3. It is used in Athens, Helsinki and Kyiv in summer.
Eastern European Summer Time is UTC+3, the summer clock for Greece, Finland, Romania, Bulgaria and the Baltics. In summer it coincides with Moscow Time, which does not move — so Helsinki and Moscow agree for half the year and differ by an hour for the other half, without Moscow having changed anything.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on EEST switches to EET (UTC+2) from late October to late March. So the 0.5-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 IRST in EEST?
9:00 AM IRST is 8:30 AM EEST.
Is EEST ahead of IRST?
EEST is 30 minutes behind IRST.
Which time zone does this use?
IRST is UTC+3:30 and EEST is UTC+3. 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.