Convert IRST to PST
PST is 11 hours 30 minutes behind IRST. IRST is UTC+3:30 and PST is UTC−8.
Right now: IRST · PST
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between IRST and PST. Someone has to take an early or late call — or use asynchronous communication instead.
| IRST | PST | Suitable? |
|---|---|---|
| 9:00 AM | 9:30 PM (previous day) | outside 9–5 |
| 10:00 AM | 10:30 PM (previous day) | outside 9–5 |
| 11:00 AM | 11:30 PM (previous day) | outside 9–5 |
| 12:00 PM | 12:30 AM | outside 9–5 |
| 1:00 PM | 1:30 AM | outside 9–5 |
| 2:00 PM | 2:30 AM | outside 9–5 |
| 3:00 PM | 3:30 AM | outside 9–5 |
| 4:00 PM | 4:30 AM | outside 9–5 |
| 5:00 PM | 5:30 AM | outside 9–5 |
IRST to PST conversion table
| IRST | PST |
|---|---|
| 12:00 AM | 12:30 PM (previous day) |
| 1:00 AM | 1:30 PM (previous day) |
| 2:00 AM | 2:30 PM (previous day) |
| 3:00 AM | 3:30 PM (previous day) |
| 4:00 AM | 4:30 PM (previous day) |
| 5:00 AM | 5:30 PM (previous day) |
| 6:00 AM | 6:30 PM (previous day) |
| 7:00 AM | 7:30 PM (previous day) |
| 8:00 AM | 8:30 PM (previous day) |
| 9:00 AM | 9:30 PM (previous day) |
| 10:00 AM | 10:30 PM (previous day) |
| 11:00 AM | 11:30 PM (previous day) |
| 12:00 PM | 12:30 AM |
| 1:00 PM | 1:30 AM |
| 2:00 PM | 2:30 AM |
| 3:00 PM | 3:30 AM |
| 4:00 PM | 4:30 AM |
| 5:00 PM | 5:30 AM |
| 6:00 PM | 6:30 AM |
| 7:00 PM | 7:30 AM |
| 8:00 PM | 8:30 AM |
| 9:00 PM | 9:30 AM |
| 10:00 PM | 10:30 AM |
| 11:00 PM | 11:30 AM |
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 PST
Pacific Standard Time (PST) is UTC−8. It is used in Los Angeles, San Francisco, Seattle and Vancouver in winter.
Pacific Standard Time is UTC−8, used by Los Angeles, San Francisco, Seattle and Vancouver from November to March. As with EST, the abbreviation is written all year in practice — a great deal of software, and most conference invitations from the US west coast, say PST when the sender means PDT. If a time from a US source looks an hour off between March and November, this is almost always why.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on PST switches to PDT (UTC−7) from March to November. So the 11.5-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 PST?
9:00 AM IRST is 9:30 PM PST (previous day).
Is PST ahead of IRST?
PST is 11 hours 30 minutes behind IRST.
Which time zone does this use?
IRST is UTC+3:30 and PST is UTC−8. 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.