Convert PDT to IRST
IRST is 10 hours 30 minutes ahead of PDT. PDT is UTC−7 and IRST is UTC+3:30.
Right now: PDT · IRST
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between PDT and IRST. Someone has to take an early or late call — or use asynchronous communication instead.
| PDT | IRST | Suitable? |
|---|---|---|
| 9:00 AM | 7:30 PM | outside 9–5 |
| 10:00 AM | 8:30 PM | outside 9–5 |
| 11:00 AM | 9:30 PM | outside 9–5 |
| 12:00 PM | 10:30 PM | outside 9–5 |
| 1:00 PM | 11:30 PM | outside 9–5 |
| 2:00 PM | 12:30 AM (next day) | outside 9–5 |
| 3:00 PM | 1:30 AM (next day) | outside 9–5 |
| 4:00 PM | 2:30 AM (next day) | outside 9–5 |
| 5:00 PM | 3:30 AM (next day) | outside 9–5 |
PDT to IRST conversion table
| PDT | IRST |
|---|---|
| 12:00 AM | 10:30 AM |
| 1:00 AM | 11:30 AM |
| 2:00 AM | 12:30 PM |
| 3:00 AM | 1:30 PM |
| 4:00 AM | 2:30 PM |
| 5:00 AM | 3:30 PM |
| 6:00 AM | 4:30 PM |
| 7:00 AM | 5:30 PM |
| 8:00 AM | 6:30 PM |
| 9:00 AM | 7:30 PM |
| 10:00 AM | 8:30 PM |
| 11:00 AM | 9:30 PM |
| 12:00 PM | 10:30 PM |
| 1:00 PM | 11:30 PM |
| 2:00 PM | 12:30 AM (next day) |
| 3:00 PM | 1:30 AM (next day) |
| 4:00 PM | 2:30 AM (next day) |
| 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) |
About PDT
Pacific Daylight Time (PDT) is UTC−7. It is used in Los Angeles, San Francisco and Seattle from March to November.
Pacific Daylight Time is UTC−7, the summer clock for Los Angeles, San Francisco, Seattle and Vancouver. It is the zone most product launches and software release times are quoted in, and it is worth converting rather than eyeballing: PDT is eight hours behind British Summer Time, not seven, because both sides have moved.
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 PDT switches to PST (UTC−8) from November to March. So the 10.5-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 PDT in IRST?
9:00 AM PDT is 7:30 PM IRST.
Is IRST ahead of PDT?
IRST is 10 hours 30 minutes ahead of PDT.
Which time zone does this use?
PDT is UTC−7 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.