Offset
The time difference between Bangladesh Standard Time and Iran Standard Time is 2.5 hours.
Bangladesh Standard Time (BST) is ahead of Iran Standard Time (IRST).
BST: UTC+6
IRST: UTC+3:30
Neither Bangladesh Standard Time nor Iran Standard Time is currently observing daylight saving time.
When to schedule
Business-hours overlap: 12 PM–5 PM in Bangladesh Standard Time (9 AM–2 PM in Iran Standard Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 2:00 PM Bangladesh Standard Time (11:30 AM Iran Standard Time).
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Bangladesh
- International Mother Language DaySat, Feb 21
- Independence and National DayThu, Mar 26
- Bengali New YearTue, Apr 14
- Labour DayFri, May 1
- July Mass Uprising DayWed, Aug 5
- Victory DayWed, Dec 16
- Christmas DayFri, Dec 25
About these zones
Bangladesh Standard Time is also known as BST. To call Bangladesh, dial +880.
Iran Standard Time is also known as IRST. To call Iran, dial +98.
Iran Standard Time is approximately 2,450 miles northwest of Bangladesh Standard Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| BST-BANGLADESH | IRST | Day |
|---|---|---|
| 12:00 am | 9:30 pm | -1 day |
| 1:00 am | 10:30 pm | -1 day |
| 2:00 am | 11:30 pm | -1 day |
| 3:00 am | 12:30 am | Same day |
| 4:00 am | 1:30 am | Same day |
| 5:00 am | 2:30 am | Same day |
| 6:00 am | 3:30 am | Same day |
| 7:00 am | 4:30 am | Same day |
| 8:00 am | 5:30 am | Same day |
| 9:00 am | 6:30 am | Same day |
| 10:00 am | 7:30 am | Same day |
| 11:00 am | 8:30 am | Same day |
| 12:00 pm | 9:30 am | Same day |
| 1:00 pm | 10:30 am | Same day |
| 2:00 pm | 11:30 am | Same day |
| 3:00 pm | 12:30 pm | Same day |
| 4:00 pm | 1:30 pm | Same day |
| 5:00 pm | 2:30 pm | Same day |
| 6:00 pm | 3:30 pm | Same day |
| 7:00 pm | 4:30 pm | Same day |
| 8:00 pm | 5:30 pm | Same day |
| 9:00 pm | 6:30 pm | Same day |
| 10:00 pm | 7:30 pm | Same day |
| 11:00 pm | 8:30 pm | Same day |
Daylight saving time
Neither Bangladesh Standard Time nor Iran Standard Time observes daylight saving time. The offset between these zones remains constant year-round.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:12 AM
- Sunset
- 6:44 PM
- Day length
- 13h 32m
- Sunrise
- 4:50 AM
- Sunset
- 7:18 PM
- Day length
- 14h 28m
Daylight overlap: 11h 24m — 7:20 AM–6:44 PM in Bangladesh Standard Time (4:50 AM–4:14 PM in Iran Standard Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Bangladesh Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Bangladesh Standard Time
- DAC
- CGP
- JSR
Airports in Iran Standard Time
- IKA
- THR
- MHD
- IFN
- PYK
- TBZ
Related conversions
Common conversions
- What is 9:00 am BST-BANGLADESH in IRST?
- 9:00 am BST-BANGLADESH is 6:30 am IRST.
- What is 12:00 pm BST-BANGLADESH in IRST?
- 12:00 pm BST-BANGLADESH is 9:30 am IRST.
- What is 12:30 pm BST-BANGLADESH in IRST?
- 12:30 pm BST-BANGLADESH is 10:00 am IRST.
- What is 2:00 pm BST-BANGLADESH in IRST?
- 2:00 pm BST-BANGLADESH is 11:30 am IRST.
- What is 5:00 pm BST-BANGLADESH in IRST?
- 5:00 pm BST-BANGLADESH is 2:30 pm IRST.
- What is 11:30 pm BST-BANGLADESH in IRST?
- 11:30 pm BST-BANGLADESH is 9:00 pm IRST.