Dhaka to Tehran
-2h 30mDhaka
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 Dhaka
WikipediaDhaka operates on Bangladesh Standard Time (BST), UTC+6. As the world's second-largest garment hub, Dhaka time coordinates global fashion supply chains.
Bangladesh is the world's second-largest garment exporter after China.
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).
Dhaka to Tehran Time Difference – Complete Guide
Dhaka runs on Bangladesh Standard Time (BDST) at UTC+06:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Dhaka 2 hours 30 minutes behind Tehran — a difference of -2h 30m at the current offsets.
In practice, when it is 9:00 AM in Dhaka it is 6:30 AM in Tehran. Midnight in Dhaka is 9:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Dhaka to Tehran time conversion table
| Dhaka (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 Dhaka to Tehran time
- Scheduling a call from Dhaka to Tehran: a 10:00 AM start in Dhaka lands at 7:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Dhaka 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 Dhaka 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 Dhaka 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 Dhaka and Tehran
Both Dhaka 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
Dhaka and Tehran share 5 hours of working-hours overlap (11:30 AM–5:00 PM BDST), so scheduling a live meeting is straightforward.
Dhaka 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 Dhaka and Tehran?
Dhaka (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 Dhaka time to Tehran time?
Add -2h 30m to Dhaka local time. For example, 9:00 AM in Dhaka 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 Dhaka.
What is the best time to call Tehran from Dhaka?
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, Dhaka or Tehran?
Dhaka is 2 hours 30 minutes behind Tehran. When it is 12:00 PM in Dhaka it is 9:30 AM in Tehran.
Do Dhaka and Tehran use different time zones?
Dhaka (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 Dhaka–Tehran difference?
Neither zone observes daylight saving time, so the -2h 30m offset between Dhaka and Tehran is fixed all year.
Which other cities share Dhaka's time zone?
BDST also covers Dhaka, Chittagong, Khulna, Rajshahi, Sylhet.
Which countries use BDST, Dhaka's zone?
BDST is used in Bangladesh.
Is there a day difference between Dhaka and Tehran?
Not normally. The -2h 30m gap only pushes the date over the previous day.
What is the time difference between Dhaka and Tehran?
Tehran is -2h 30m from Dhaka.
What timezone is Dhaka in?
Dhaka operates on Bangladesh Standard Time (BST), UTC+6. As the world's second-largest garment hub, Dhaka time coordinates global fashion supply chains.
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 Dhaka?
Standard business hours in Dhaka are 9:00 AM - 5:00 PM BST.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What is the best time to schedule a call between Dhaka and Tehran?
The best overlap for a call is when both cities are in business hours. Dhaka works 9:00 AM - 5:00 PM BST and Tehran works 8:00 AM - 4:00 PM IRST (-2h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Dhaka and Tehran?
Dhaka uses BDT (৳) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Dhaka and Tehran compare in size?
Dhaka has a population of approximately 10.3 million (metro: 22.5 million), while Tehran has approximately 9.4 million (metro: 16.8 million).
What are the major landmarks in Dhaka and Tehran?
Dhaka is known for Lalbagh Fort, Ahsan Manzil, National Parliament House. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.
Do Dhaka and Tehran have stock exchanges?
Yes. Dhaka has the DSE (Dhaka Stock Exchange) and Tehran has the TSE (Tehran Stock Exchange). The -2h 30m time difference affects trading hour overlaps between these exchanges.
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 Dhaka, what time is it in Tehran?
When it is 12:00 AM (midnight) in Dhaka (BDST), it is -2h 30m later in Tehran (IRST).
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