Convert Iran Standard Time to Hawaii Standard Time
Instantly convert Iran Standard Time (IRST) to Hawaii Standard Time (HST) with our free online calculator.
Iran Standard Time
08:50:59 AM
Wed, Jun 24 (IRST)
Hawaii Standard Time
07:20:59 PM
Tue, Jun 23 (HST)
Convert a Specific Time
24-Hour Comparison
| IRST | HST |
|---|---|
| 12:00 AM | 10.5:00 AM(-1d) |
| 1:00 AM | 11.5:00 AM(-1d) |
| 2:00 AM | 0.5:00 PM(-1d) |
| 3:00 AM | 1.5:00 PM(-1d) |
| 4:00 AM | 2.5:00 PM(-1d) |
| 5:00 AM | 3.5:00 PM(-1d) |
| 6:00 AM | 4.5:00 PM(-1d) |
| 7:00 AM | 5.5:00 PM(-1d) |
| 8:00 AM | 6.5:00 PM(-1d) |
| 9:00 AM | 7.5:00 PM(-1d) |
| 10:00 AM | 8.5:00 PM(-1d) |
| 11:00 AM | 9.5:00 PM(-1d) |
| 12:00 PM | 10.5:00 PM(-1d) |
| 1:00 PM | 11.5:00 PM(-1d) |
| 2:00 PM | 0.5:00 AM |
| 3:00 PM | 1.5:00 AM |
| 4:00 PM | 2.5:00 AM |
| 5:00 PM | 3.5:00 AM |
| 6:00 PM | 4.5:00 AM |
| 7:00 PM | 5.5:00 AM |
| 8:00 PM | 6.5:00 AM |
| 9:00 PM | 7.5:00 AM |
| 10:00 PM | 8.5:00 AM |
| 11:00 PM | 9.5:00 AM |
How to Convert Iran Standard Time to Hawaii Standard Time
Formula
To convert Iran Standard Time (IRST) to Hawaii Standard Time (HST): Convert IRST to HST
About Iran Standard Time (IRST)
Iran Standard Time (IRST, IANA: Asia/Tehran) is the civil time of the Islamic Republic of Iran, set at UTC+3:30 — one of the world's few 30-minute-offset time zones. IRST observes Daylight Saving Time (switching to IRDT = UTC+4:30) from the last Wednesday of the Iranian month of Farvardin (~March 22) to the last Wednesday of Shahrivar (~September 22) per Iranian government calendar (the country abolished DST in 2022 then partially reinstated it for energy savings — the schedule is subject to change by Iranian Parliament Majlis decree). The 30-minute offset is preserved because Iran's central meridian is approximately 52.5°E, between UTC+3 and UTC+4 standard zones, and the Iranian Solar Hijri calendar has its own astronomical traditions for time-keeping. IRST serves approximately 88 million Iranian people across 31 provinces. Major cities: Tehran (8.7M city, 13M metro — capital), Mashhad (3.1M), Isfahan (2.2M), Karaj (1.6M), Shiraz (1.6M), Tabriz (1.6M), Qom (1.2M). Other 30/45-minute offset zones: India (UTC+5:30), Nepal (UTC+5:45), Myanmar (UTC+6:30), Newfoundland (UTC-3:30), Afghanistan (UTC+4:30), Marquesas (UTC-9:30). Affects: Tehran Stock Exchange (TSE) trading, Iranian Solar Hijri New Year Nowruz celebrations.
About Hawaii Standard Time (HST)
Hawaii Standard Time (HST, IANA: Pacific/Honolulu) is the time zone for the State of Hawaii and the Aleutian Islands of Alaska west of 169.5°W. HST is UTC-10:00 year-round and does not observe Daylight Saving Time per Hawaii Revised Statutes §1-31 (Hawaii opted out of the Uniform Time Act of 1966). When the US mainland switches to Daylight Saving Time in March, the offset from Hawaii to the West Coast (Pacific Time) becomes 3 hours instead of the standard 2 hours. Honolulu sees solar noon at approximately 12:30 PM HST in summer. HST is the same offset as Cook Island Time (CKT) and Tahiti Time (TAHT) in French Polynesia, allowing easy mental conversion across the central Pacific. Time-sensitive activities affected by HST include Pacific tsunami warning system coordination per NOAA NTWC, US military operations from Joint Base Pearl Harbor-Hickam, and the Mauna Kea astronomical observatories' nightly observing schedules.