Convert Iran Standard Time to Japan Standard Time
Instantly convert Iran Standard Time (IRST) to Japan Standard Time (JST) with our free online calculator.
Iran Standard Time
08:50:49 AM
Wed, Jun 24 (IRST)
Japan Standard Time
02:20:49 PM
Wed, Jun 24 (JST)
Convert a Specific Time
24-Hour Comparison
| IRST | JST |
|---|---|
| 12:00 AM | 5.5:00 AM |
| 1:00 AM | 6.5:00 AM |
| 2:00 AM | 7.5:00 AM |
| 3:00 AM | 8.5:00 AM |
| 4:00 AM | 9.5:00 AM |
| 5:00 AM | 10.5:00 AM |
| 6:00 AM | 11.5:00 AM |
| 7:00 AM | 0.5:00 PM |
| 8:00 AM | 1.5:00 PM |
| 9:00 AM | 2.5:00 PM |
| 10:00 AM | 3.5:00 PM |
| 11:00 AM | 4.5:00 PM |
| 12:00 PM | 5.5:00 PM |
| 1:00 PM | 6.5:00 PM |
| 2:00 PM | 7.5:00 PM |
| 3:00 PM | 8.5:00 PM |
| 4:00 PM | 9.5:00 PM |
| 5:00 PM | 10.5:00 PM |
| 6:00 PM | 11.5:00 PM |
| 7:00 PM | 0.5:00 AM(+1d) |
| 8:00 PM | 1.5:00 AM(+1d) |
| 9:00 PM | 2.5:00 AM(+1d) |
| 10:00 PM | 3.5:00 AM(+1d) |
| 11:00 PM | 4.5:00 AM(+1d) |
How to Convert Iran Standard Time to Japan Standard Time
Formula
To convert Iran Standard Time (IRST) to Japan Standard Time (JST): Convert IRST to JST
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 Japan Standard Time (JST)
Japan Standard Time (JST, IANA: Asia/Tokyo) is the civil time of Japan, set at UTC+9:00 year-round (no DST). Japan observed Daylight Saving Time only briefly during American Occupation (1948-1951) and discontinued it after the Treaty of San Francisco. JST is also called Nippon Hyōjunji (日本標準時) and is officially maintained by the National Institute of Information and Communications Technology (NICT) — Japan operates a sophisticated atomic-clock-based timekeeping system at NICT Koganei facility with caesium beam frequency standards CSF-2 + Sr-87 optical lattice clock. JST is identical in offset to Korea Standard Time (KST), Yakutsk Time (Russian Far East), Western Indonesian Time WIT (eastern Indonesia), and Palau Time (PWT). JST serves Japan's approximately 125 million residents across 47 prefectures. Major JST cities: Tokyo (14M city, 37M metro — the world's largest metropolitan area by population), Yokohama (3.8M — Tokyo bay metro), Osaka (2.7M, Kansai region 19M metro), Nagoya (2.3M, Chukyo region 9.5M metro), Sapporo (1.9M — Hokkaido capital), Fukuoka (1.6M — Kyushu hub), Kobe (1.5M), Kawasaki (1.5M), Saitama (1.3M). Affects: TSE (Tokyo Stock Exchange) trading hours 09:00-15:00 JST, Tokyo Sumo Grand Tournaments, Shinkansen bullet-train scheduling, Tokyo Disney + USJ park operating hours.