Convert Iran Standard Time to Mountain Daylight Time
Instantly convert Iran Standard Time (IRST) to Mountain Daylight Time (MDT) with our free online calculator.
Iran Standard Time
08:50:59 AM
Wed, Jun 24 (IRST)
Mountain Daylight Time
11:20:59 PM
Tue, Jun 23 (MDT)
Convert a Specific Time
24-Hour Comparison
| IRST | MDT |
|---|---|
| 12:00 AM | 2.5:00 PM(-1d) |
| 1:00 AM | 3.5:00 PM(-1d) |
| 2:00 AM | 4.5:00 PM(-1d) |
| 3:00 AM | 5.5:00 PM(-1d) |
| 4:00 AM | 6.5:00 PM(-1d) |
| 5:00 AM | 7.5:00 PM(-1d) |
| 6:00 AM | 8.5:00 PM(-1d) |
| 7:00 AM | 9.5:00 PM(-1d) |
| 8:00 AM | 10.5:00 PM(-1d) |
| 9:00 AM | 11.5:00 PM(-1d) |
| 10:00 AM | 0.5:00 AM |
| 11:00 AM | 1.5:00 AM |
| 12:00 PM | 2.5:00 AM |
| 1:00 PM | 3.5:00 AM |
| 2:00 PM | 4.5:00 AM |
| 3:00 PM | 5.5:00 AM |
| 4:00 PM | 6.5:00 AM |
| 5:00 PM | 7.5:00 AM |
| 6:00 PM | 8.5:00 AM |
| 7:00 PM | 9.5:00 AM |
| 8:00 PM | 10.5:00 AM |
| 9:00 PM | 11.5:00 AM |
| 10:00 PM | 0.5:00 PM |
| 11:00 PM | 1.5:00 PM |
How to Convert Iran Standard Time to Mountain Daylight Time
Formula
To convert Iran Standard Time (IRST) to Mountain Daylight Time (MDT): Convert IRST to MDT
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 Daylight Time (MDT)
Mountain Daylight Time (MDT, IANA: America/Denver during DST window) is the summer-time variant of MST, set at UTC-6:00 — observed from the second Sunday in March to the first Sunday in November per the Energy Policy Act of 2005. MDT shares the same UTC offset as Central Standard Time (CST), which can cause cross-time-zone scheduling confusion during the DST transition windows in March and November. The Navajo Nation in northeastern Arizona does observe MDT (unlike the rest of Arizona), creating one of the rare US sub-state time-zone exceptions per the Navajo Nation Council's 1968 resolution. MDT applies in Colorado, Utah, Wyoming, Montana, Idaho east, New Mexico, parts of Texas, and Canadian Rocky Mountain provinces (Alberta, eastern BC). Used in coordination of: Denver International Airport flight operations, ski-area lift hours during shoulder-season DST window, Yellowstone National Park ranger schedules, US National Renewable Energy Lab operations, and FAA Albuquerque ARTCC ATC operations.