Convert Bangladesh Standard Time to Iran Standard Time
Instantly convert Bangladesh Standard Time (BST) to Iran Standard Time (IRST) with our free online calculator.
Bangladesh Standard Time
11:20:53 AM
Wed, Jun 24 (BST)
Iran Standard Time
08:50:53 AM
Wed, Jun 24 (IRST)
Convert a Specific Time
24-Hour Comparison
| BST | IRST |
|---|---|
| 12:00 AM | 9.5:00 PM(-1d) |
| 1:00 AM | 10.5:00 PM(-1d) |
| 2:00 AM | 11.5:00 PM(-1d) |
| 3:00 AM | 0.5:00 AM |
| 4:00 AM | 1.5:00 AM |
| 5:00 AM | 2.5:00 AM |
| 6:00 AM | 3.5:00 AM |
| 7:00 AM | 4.5:00 AM |
| 8:00 AM | 5.5:00 AM |
| 9:00 AM | 6.5:00 AM |
| 10:00 AM | 7.5:00 AM |
| 11:00 AM | 8.5:00 AM |
| 12:00 PM | 9.5:00 AM |
| 1:00 PM | 10.5:00 AM |
| 2:00 PM | 11.5:00 AM |
| 3:00 PM | 0.5:00 PM |
| 4:00 PM | 1.5:00 PM |
| 5:00 PM | 2.5:00 PM |
| 6:00 PM | 3.5:00 PM |
| 7:00 PM | 4.5:00 PM |
| 8:00 PM | 5.5:00 PM |
| 9:00 PM | 6.5:00 PM |
| 10:00 PM | 7.5:00 PM |
| 11:00 PM | 8.5:00 PM |
How to Convert Bangladesh Standard Time to Iran Standard Time
Formula
To convert Bangladesh Standard Time (BST) to Iran Standard Time (IRST): Convert BST to IRST
About Bangladesh Standard Time (BST)
Bangladesh Standard Time (BST, IANA: Asia/Dhaka) is the civil time of the People's Republic of Bangladesh, set at UTC+6:00 year-round. Bangladesh introduced Daylight Saving Time in 2009 (clocks advanced one hour) but abolished it later in 2009 after public confusion + religious-prayer-time complications. BST is identical in offset to Bhutan Time (BTT), Kyrgyzstan Time (KGT), Omsk Time (Russian Federation Yekaterinburg region), and Vostok Antarctica Time — facilitating cross-Central-Asia + South-Asia coordination. The 'BST' abbreviation is ambiguous globally — it also stands for British Summer Time (UTC+1), so in international aviation/business contexts the IANA identifier 'Asia/Dhaka' is preferred. BST serves approximately 170 million Bangladeshi people across 8 divisions + 64 districts. Major cities: Dhaka (10M city, 22M metro — the world's 4th most populous city after Tokyo/Delhi/Shanghai), Chittagong (2.6M city, 5.5M metro — main seaport on the Bay of Bengal), Khulna (660K), Rajshahi (450K), Sylhet (480K), Barisal (330K), Rangpur (340K), Mymensingh (260K). Affects: Dhaka Stock Exchange (DSE) trading hours, garment-industry shift scheduling (textile manufacturing is Bangladesh's largest export industry).
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.