Offset
The time difference between Iran Standard Time and Hawaii Time is 13.5 hours.
Iran Standard Time (IRST) is ahead of Hawaii Time (HST).
IRST: UTC+3:30
HST: UTC-10
Neither Iran Standard Time nor Hawaii Time is currently observing daylight saving time.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Iran Standard Time and Hawaii Time don't overlap on the same weekday. Hawaii Time is 13 hours behind Iran Standard Time.
Realistic options: hand off asynchronously, or stretch one side by an hour to catch the other team at the start or end of their day.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
About these zones
Iran Standard Time is also known as IRST. To call Iran, dial +98.
Hawaii Time is also known as HST. To call United States, dial +1.
Hawaii Time is approximately 8,050 miles northeast of Iran Standard Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| IRST | HST | Day |
|---|---|---|
| 12:00 am | 10:30 am | -1 day |
| 1:00 am | 11:30 am | -1 day |
| 2:00 am | 12:30 pm | -1 day |
| 3:00 am | 1:30 pm | -1 day |
| 4:00 am | 2:30 pm | -1 day |
| 5:00 am | 3:30 pm | -1 day |
| 6:00 am | 4:30 pm | -1 day |
| 7:00 am | 5:30 pm | -1 day |
| 8:00 am | 6:30 pm | -1 day |
| 9:00 am | 7:30 pm | -1 day |
| 10:00 am | 8:30 pm | -1 day |
| 11:00 am | 9:30 pm | -1 day |
| 12:00 pm | 10:30 pm | -1 day |
| 1:00 pm | 11:30 pm | -1 day |
| 2:00 pm | 12:30 am | Same day |
| 3:00 pm | 1:30 am | Same day |
| 4:00 pm | 2:30 am | Same day |
| 5:00 pm | 3:30 am | Same day |
| 6:00 pm | 4:30 am | Same day |
| 7:00 pm | 5:30 am | Same day |
| 8:00 pm | 6:30 am | Same day |
| 9:00 pm | 7:30 am | Same day |
| 10:00 pm | 8:30 am | Same day |
| 11:00 pm | 9:30 am | Same day |
Daylight saving time
Neither Iran Standard Time nor Hawaii Time observes daylight saving time. The offset between these zones remains constant year-round.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 4:50 AM
- Sunset
- 7:18 PM
- Day length
- 14h 28m
- Sunrise
- 5:50 AM
- Sunset
- 7:12 PM
- Day length
- 13h 22m
Daylight overlap: 3h 52m — 4:50 AM–8:42 AM in Iran Standard Time (3:20 PM–7:12 PM in Hawaii Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Hawaii Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Iran Standard Time
- IKA
- THR
- MHD
- IFN
- PYK
- TBZ
Airports in Hawaii Time
- HNL
Related conversions
Common conversions
- What is 9:00 am IRST in HST?
- 9:00 am IRST is 7:30 pm HST, the previous day.
- What is 12:00 pm IRST in HST?
- 12:00 pm IRST is 10:30 pm HST, the previous day.
- What is 12:30 pm IRST in HST?
- 12:30 pm IRST is 11:00 pm HST, the previous day.
- What is 2:00 pm IRST in HST?
- 2:00 pm IRST is 12:30 am HST.
- What is 5:00 pm IRST in HST?
- 5:00 pm IRST is 3:30 am HST.
- What is 11:30 pm IRST in HST?
- 11:30 pm IRST is 10:00 am HST.