PST to IRST Time Converter
IRST is 10 hours and 30 minutes ahead of PST. The US West Coast is currently on PDT (UTC-7:00), and IRST is UTC+3:30.
Best Time to Call Between PST and IRST
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 12:00 PM PST, which is 5:30 PM to 10:30 PM IRST.
both at work PST only IRST only neither — hours along the strip are PST.
Common Times Converted
PST on the left, IRST on the right.
PST to IRST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| PST | IRST | Working hours |
|---|---|---|
| 12:00 AM | 10:30 AM | IRST only |
| 1:00 AM | 11:30 AM | IRST only |
| 2:00 AM | 12:30 PM | IRST only |
| 3:00 AM | 1:30 PM | IRST only |
| 4:00 AM | 2:30 PM | IRST only |
| 5:00 AM | 3:30 PM | IRST only |
| 6:00 AM | 4:30 PM | IRST only |
| 7:00 AM | 5:30 PM | — |
| 8:00 AM | 6:30 PM | — |
| 9:00 AM | 7:30 PM | PST only |
| 10:00 AM | 8:30 PM | PST only |
| 11:00 AM | 9:30 PM | PST only |
| 12:00 PM | 10:30 PM | PST only |
| 1:00 PM | 11:30 PM | PST only |
| 2:00 PM | 12:30 AM next day | PST only |
| 3:00 PM | 1:30 AM next day | PST only |
| 4:00 PM | 2:30 AM next day | PST only |
| 5:00 PM | 3:30 AM next day | — |
| 6:00 PM | 4:30 AM next day | — |
| 7:00 PM | 5:30 AM next day | — |
| 8:00 PM | 6:30 AM next day | — |
| 9:00 PM | 7:30 AM next day | — |
| 10:00 PM | 8:30 AM next day | — |
| 11:00 PM | 9:30 AM next day | IRST only |
What PST and IRST Actually Are
PST — Pacific Standard Time
Los Angeles, San Francisco, Seattle, Las Vegas, Vancouver. Standing at UTC-8:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to PST. The Philippines occasionally uses PST for Philippine Standard Time (UTC+8); PHT is the clearer label for that.
California voted in 2018 to move to permanent daylight time, but the change needs an act of Congress and has never happened, so PST is still the winter standard.
IRST — Iran Standard Time
Tehran, Mashhad, Isfahan. Standing at UTC+3:30 as written, and the region does not change its clocks, so that offset holds all year. Iran abolished daylight saving in 2022, so the half-hour offset now holds all year.
Iran abolished daylight saving in 2022. Its half-hour offset is a deliberate compromise between the solar times of its western and eastern borders.
What This Means in Practice
Expect times on the half hour
IRST sits on a 30-minute offset rather than a whole hour, so a round number on one side is never a round number on the other. A 9:00 meeting becomes 30 minutes past the hour, which is exactly the detail calendar invitations get wrong when someone converts in their head.
The date changes mid-working-day
For 3 of the eight hours in a normal PST working day, the equivalent IRST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
This gap is not fixed
PST changes its clocks and IRST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Nearly opposite sides of the clock
At 10 hours and 30 minutes apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on PST
Cities on IRST
Frequently Asked Questions
What is the time difference between PST and IRST?
IRST is 10 hours and 30 minutes ahead of PST. That is the live figure. Taken strictly as written, the gap between PST and IRST is 11 hours and 30 minutes — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM PST in IRST?
9:00 AM PST is 7:30 PM IRST.
What are the best hours to schedule a call between PST and IRST?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 7:00 AM to 12:00 PM PST, which is 5:30 PM to 10:30 PM IRST.
Does the difference between PST and IRST change during the year?
Yes. PST observes daylight saving and IRST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does PST always mean Pacific Standard Time?
The Philippines occasionally uses PST for Philippine Standard Time (UTC+8); PHT is the clearer label for that.
Does IRST always mean Iran Standard Time?
Iran abolished daylight saving in 2022, so the half-hour offset now holds all year.