Convert Iran Standard Time to Mountain Standard Time
Instantly convert Iran Standard Time (IRST) to Mountain Standard Time (MST) with our free online calculator.
Iran Standard Time
08:50:59 AM
Wed, Jun 24 (IRST)
Mountain Standard Time
10:20:59 PM
Tue, Jun 23 (MST)
Convert a Specific Time
24-Hour Comparison
| IRST | MST |
|---|---|
| 12:00 AM | 1.5:00 PM(-1d) |
| 1:00 AM | 2.5:00 PM(-1d) |
| 2:00 AM | 3.5:00 PM(-1d) |
| 3:00 AM | 4.5:00 PM(-1d) |
| 4:00 AM | 5.5:00 PM(-1d) |
| 5:00 AM | 6.5:00 PM(-1d) |
| 6:00 AM | 7.5:00 PM(-1d) |
| 7:00 AM | 8.5:00 PM(-1d) |
| 8:00 AM | 9.5:00 PM(-1d) |
| 9:00 AM | 10.5:00 PM(-1d) |
| 10:00 AM | 11.5:00 PM(-1d) |
| 11:00 AM | 0.5:00 AM |
| 12:00 PM | 1.5:00 AM |
| 1:00 PM | 2.5:00 AM |
| 2:00 PM | 3.5:00 AM |
| 3:00 PM | 4.5:00 AM |
| 4:00 PM | 5.5:00 AM |
| 5:00 PM | 6.5:00 AM |
| 6:00 PM | 7.5:00 AM |
| 7:00 PM | 8.5:00 AM |
| 8:00 PM | 9.5:00 AM |
| 9:00 PM | 10.5:00 AM |
| 10:00 PM | 11.5:00 AM |
| 11:00 PM | 0.5:00 PM |
How to Convert Iran Standard Time to Mountain Standard Time
Formula
To convert Iran Standard Time (IRST) to Mountain Standard Time (MST): Convert IRST to MST
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 Mountain Standard Time (MST)
Mountain Standard Time (MST, IANA: America/Denver and America/Phoenix) is the time zone for the US Mountain region and most of Canada's Rocky Mountain provinces, set at UTC-7:00. MST is observed from the first Sunday in November to the second Sunday in March; the region switches to Mountain Daylight Time (MDT = UTC-6:00) for the remainder of the year — EXCEPT for the State of Arizona (excluding Navajo Nation), which stays on MST year-round per Arizona Revised Statutes §1-242. Major MST cities: Denver, Phoenix, Salt Lake City, Albuquerque, El Paso, Tucson, Calgary, Edmonton. MST covers Colorado, Utah, Wyoming, Montana, Idaho (most), New Mexico, Arizona, parts of Texas + Mexico (Sonora). Population ~17 million in the time zone. Affects: NORAD Cheyenne Mountain operations, Denver Mile-High Stadium NFL game scheduling, Colorado ski-resort lift-operating hours, US Bureau of Land Management permit operations, and the Mormon Tabernacle Choir broadcast schedule from Salt Lake City.