Convert Coordinated Universal Time to Iran Standard Time
Instantly convert Coordinated Universal Time (UTC) to Iran Standard Time (IRST) with our free online calculator.
Coordinated Universal Time
05:20:49 AM
Wed, Jun 24 (UTC)
Iran Standard Time
08:50:49 AM
Wed, Jun 24 (IRST)
Convert a Specific Time
24-Hour Comparison
| UTC | IRST |
|---|---|
| 12:00 AM | 3.5:00 AM |
| 1:00 AM | 4.5:00 AM |
| 2:00 AM | 5.5:00 AM |
| 3:00 AM | 6.5:00 AM |
| 4:00 AM | 7.5:00 AM |
| 5:00 AM | 8.5:00 AM |
| 6:00 AM | 9.5:00 AM |
| 7:00 AM | 10.5:00 AM |
| 8:00 AM | 11.5:00 AM |
| 9:00 AM | 0.5:00 PM |
| 10:00 AM | 1.5:00 PM |
| 11:00 AM | 2.5:00 PM |
| 12:00 PM | 3.5:00 PM |
| 1:00 PM | 4.5:00 PM |
| 2:00 PM | 5.5:00 PM |
| 3:00 PM | 6.5:00 PM |
| 4:00 PM | 7.5:00 PM |
| 5:00 PM | 8.5:00 PM |
| 6:00 PM | 9.5:00 PM |
| 7:00 PM | 10.5:00 PM |
| 8:00 PM | 11.5:00 PM |
| 9:00 PM | 0.5:00 AM(+1d) |
| 10:00 PM | 1.5:00 AM(+1d) |
| 11:00 PM | 2.5:00 AM(+1d) |
How to Convert Coordinated Universal Time to Iran Standard Time
Formula
To convert Coordinated Universal Time (UTC) to Iran Standard Time (IRST): Convert UTC to IRST
About Coordinated Universal Time (UTC)
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time, defined since 1972 as the time at the Prime Meridian (0° longitude) maintained by BIPM (Bureau International des Poids et Mesures) in Sèvres, France. UTC is computed as a weighted average of approximately 400 atomic clocks at ~80 national metrology institutes (NIST in the US, NPL in UK, PTB in Germany, NICT in Japan, KRISS in Korea, etc.) per the formal definition in ITU-R Recommendation TF.460-6 (2002). UTC is functionally identical to GMT (Greenwich Mean Time) for civil purposes but differs slightly in its underlying timescale — UTC uses atomic seconds with occasional leap seconds inserted (announced by IERS Bulletin C ~6 months in advance, last leap second was December 31, 2016, and the system may be retired by 2035 per Resolution D of CGPM 2022). UTC is the standard for aviation (ICAO Annex 5), maritime navigation (IMO COLREGS), all internet protocols (NTP, PTP per IEEE 1588), all scientific publications, GPS / Galileo / GLONASS / BeiDou GNSS, and Universal Time on Wikipedia/Wikidata.
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.