Bangladesh to Tehran
-2h 30mBangladesh
BDSTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
BDST and IRST on the World Map
The map below highlights the BDST (Bangladesh Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
BDST – Bangladesh Standard Time
UTC+06:00Bangladesh Standard Time (BDST, UTC+06:00) is the time zone for Bangladesh, 6 hours ahead of UTC.
- •Bangladesh uses a single time zone, UTC+06:00, across the entire country.
- •Bangladesh does not observe daylight saving time, so the offset is fixed all year.
- •Dhaka is one of the most densely populated cities globally.
- •BDST is written here to distinguish it from British Summer Time (BST).
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
Comparing Time Zones: Bangladesh and Tehran
Bangladesh runs on Bangladesh Standard Time (BDST) at UTC+06:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Bangladesh 2 hours 30 minutes behind Tehran — a difference of -2h 30m at the current offsets.
In practice, when it is 9:00 AM in Bangladesh it is 6:30 AM in Tehran. Midnight in Bangladesh is 9:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Bangladesh to Tehran time conversion table
| Bangladesh (BDST) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 9:30 PM | previous 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 |
| 12:00 PM | 9:30 AM | same day |
| 3:00 PM | 12:30 PM | same day |
| 5:00 PM | 2:30 PM | same day |
| 6:00 PM | 3:30 PM | same day |
| 9:00 PM | 6:30 PM | same day |
Why people convert Bangladesh to Tehran time
- Scheduling a call from Bangladesh to Tehran: a 10:00 AM start in Bangladesh lands at 7:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Bangladesh and Tehran are inside the 9-to-5 working day between 11:30 AM and 5:00 PM BDST time (9:00 AM–2:30 PM IRST). That is roughly 5 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking Tehran local time against Bangladesh keeps pickup windows and arrival estimates honest across the -2h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM BDST" is unambiguous; "3 PM" across a -2h 30m gap is not.
- Block 11:30 AM–5:00 PM BDST as the recurring meeting window if you work primarily from Bangladesh and need Tehran colleagues present.
About BDST (Bangladesh Standard Time)
Bangladesh Standard Time (BDST) is the single time zone used across Bangladesh, fixed at UTC+06:00 all year. Bangladesh has not observed daylight saving time since a short-lived experiment in 2009, so the gap between Bangladesh and every other zone is constant. Dhaka, the capital, is one of the most densely populated cities in the world. Because the country sits close to the middle of the UTC+06:00 band, solar noon is near 12:00 for most of the year. BDST is listed separately from British Summer Time, which shares the BST abbreviation but is UTC+01:00.
About IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
Best time to call between Bangladesh and Tehran
Both Bangladesh and Tehran sit inside the 9 AM – 5 PM working day between 11:30 AM–5:00 PM BDST, which is 9:00 AM–2:30 PM IRST. That gives roughly 5 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Bangladesh and Tehran share 5 hours of working-hours overlap (11:30 AM–5:00 PM BDST), so scheduling a live meeting is straightforward.
Bangladesh is 2 hours 30 minutes behind Tehran (BDST UTC+06:00 → IRST UTC+03:30). The shared working window is 11:30 AM–5:00 PM BDST. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Bangladesh and Tehran?
Bangladesh (BDST, UTC+06:00) is 2 hours 30 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -2h 30m.
How do I convert Bangladesh time to Tehran time?
Add -2h 30m to Bangladesh local time. For example, 9:00 AM in Bangladesh is 6:30 AM in Tehran.
What time is it in Tehran right now?
Tehran uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h 30m offset from Bangladesh.
What is the best time to call Tehran from Bangladesh?
Call between 11:30 AM and 5:00 PM BDST — that maps to 9:00 AM–2:30 PM IRST and keeps both parties inside the working day.
Which is behind, Bangladesh or Tehran?
Bangladesh is 2 hours 30 minutes behind Tehran. When it is 12:00 PM in Bangladesh it is 9:30 AM in Tehran.
Do Bangladesh and Tehran use different time zones?
Bangladesh (Bangladesh) uses BDST at UTC+06:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Dhaka and Asia/Tehran.
Does daylight saving time affect the Bangladesh–Tehran difference?
Neither zone observes daylight saving time, so the -2h 30m offset between Bangladesh and Tehran is fixed all year.
Which other cities share Bangladesh's time zone?
BDST also covers Dhaka, Chittagong, Khulna, Rajshahi, Sylhet.
Which countries use BDST, Bangladesh's zone?
BDST is used in Bangladesh.
Is there a day difference between Bangladesh and Tehran?
Not normally. The -2h 30m gap only pushes the date over the previous day.
What is the time difference between Bangladesh and Tehran?
Tehran is -2h 30m from Bangladesh.
What timezone is Bangladesh in?
Bangladesh operates on its local timezone.
What timezone is Tehran in?
Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
Which countries use BDST (Bangladesh Standard Time)?
BDST is used in Bangladesh.
Does BDST observe daylight saving time?
No, BDST does not observe daylight saving time and remains at UTC+06:00 year-round.
What are some interesting facts about BDST?
Bangladesh uses a single time zone, UTC+06:00, across the entire country. Bangladesh does not observe daylight saving time, so the offset is fixed all year.
Which cities are in the IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
When is it midnight in Bangladesh, what time is it in Tehran?
When it is 12:00 AM (midnight) in Bangladesh (BDST), it is -2h 30m later in Tehran (IRST).
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