Convert Iran Standard Time to Central Daylight Time
Instantly convert Iran Standard Time (IRST) to Central Daylight Time (CDT) with our free online calculator.
Iran Standard Time
08:50:59 AM
Wed, Jun 24 (IRST)
Central Daylight Time
12:20:59 AM
Wed, Jun 24 (CDT)
Convert a Specific Time
24-Hour Comparison
| IRST | CDT |
|---|---|
| 12:00 AM | 3.5:00 PM(-1d) |
| 1:00 AM | 4.5:00 PM(-1d) |
| 2:00 AM | 5.5:00 PM(-1d) |
| 3:00 AM | 6.5:00 PM(-1d) |
| 4:00 AM | 7.5:00 PM(-1d) |
| 5:00 AM | 8.5:00 PM(-1d) |
| 6:00 AM | 9.5:00 PM(-1d) |
| 7:00 AM | 10.5:00 PM(-1d) |
| 8:00 AM | 11.5:00 PM(-1d) |
| 9:00 AM | 0.5:00 AM |
| 10:00 AM | 1.5:00 AM |
| 11:00 AM | 2.5:00 AM |
| 12:00 PM | 3.5:00 AM |
| 1:00 PM | 4.5:00 AM |
| 2:00 PM | 5.5:00 AM |
| 3:00 PM | 6.5:00 AM |
| 4:00 PM | 7.5:00 AM |
| 5:00 PM | 8.5:00 AM |
| 6:00 PM | 9.5:00 AM |
| 7:00 PM | 10.5:00 AM |
| 8:00 PM | 11.5:00 AM |
| 9:00 PM | 0.5:00 PM |
| 10:00 PM | 1.5:00 PM |
| 11:00 PM | 2.5:00 PM |
How to Convert Iran Standard Time to Central Daylight Time
Formula
To convert Iran Standard Time (IRST) to Central Daylight Time (CDT): Convert IRST to CDT
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 Central Daylight Time (CDT)
Central Daylight Time (CDT, IANA: America/Chicago during DST window) is the summer-time variant of CST, set at UTC-5:00 — observed from the second Sunday in March to the first Sunday in November per the US Energy Policy Act of 2005. CDT shares the same UTC offset as Eastern Standard Time (EST), so during winter months Chicago/Dallas are one hour behind New York/Atlanta, but during summer months Chicago/Dallas are still one hour behind because both regions advance equally for DST. The 'spring forward / fall back' transition affects an estimated 311 million US residents annually per Census data. CDT is used in 16 US states partially or fully (Illinois, Texas, Wisconsin, Minnesota, Iowa, Missouri, Arkansas, Louisiana, Mississippi, Alabama, Tennessee, Kansas, Nebraska, Oklahoma, North Dakota, South Dakota) and parts of Canada (Manitoba, western Ontario, Saskatchewan partial — Saskatchewan stays on CST year-round, an exception). Affects MLB season game scheduling, CME / CBOT commodity trading hours, and US-Canada-Mexico USMCA cross-border supply-chain handoffs.