Tehran to Dhaka
+2h 30mTehran
IRSTSOURCEDhaka
BDSTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and BDST on the World Map
The map below highlights the IRST (Iran Standard Time) and BDST (Bangladesh Standard Time) timezone regions across the globe.
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.
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).
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).
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.
Everything You Need to Know About Tehran and Dhaka Time
Tehran runs on Iran Standard Time (IRST) at UTC+03:30. Dhaka runs on Bangladesh Standard Time (BDST) at UTC+06:00. That puts Tehran 2 hours 30 minutes ahead of Dhaka — a difference of +2h 30m at the current offsets.
In practice, when it is 9:00 AM in Tehran it is 11:30 AM in Dhaka. Midnight in Tehran is 2:30 AM in Dhaka. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Tehran to Dhaka time conversion table
| Tehran (IRST) | Dhaka (BDST) | Day |
|---|---|---|
| 12:00 AM | 2:30 AM | same day |
| 6:00 AM | 8:30 AM | same day |
| 7:00 AM | 9:30 AM | same day |
| 8:00 AM | 10:30 AM | same day |
| 9:00 AM | 11:30 AM | same day |
| 12:00 PM | 2:30 PM | same day |
| 3:00 PM | 5:30 PM | same day |
| 5:00 PM | 7:30 PM | same day |
| 6:00 PM | 8:30 PM | same day |
| 9:00 PM | 11:30 PM | same day |
Why people convert Tehran to Dhaka time
- Scheduling a call from Tehran to Dhaka: a 10:00 AM start in Tehran lands at 12:30 PM in Dhaka, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Tehran and Dhaka are inside the 9-to-5 working day between 9:00 AM and 2:30 PM IRST time (11:30 AM–5:00 PM BDST). That is roughly 5 hours 30 minutes of usable overlap.
- Coordinating a Tehran-based team with Dhaka contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +2h 30m gap is not.
- Block 9:00 AM–2:30 PM IRST as the recurring meeting window if you work primarily from Tehran and need Dhaka colleagues present.
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.
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.
Best time to call between Tehran and Dhaka
Both Tehran and Dhaka sit inside the 9 AM – 5 PM working day between 9:00 AM–2:30 PM IRST, which is 11:30 AM–5:00 PM BDST. That gives roughly 5 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Tehran and Dhaka share 5 hours of working-hours overlap (9:00 AM–2:30 PM IRST), so scheduling a live meeting is straightforward.
Tehran is 2 hours 30 minutes ahead of Dhaka (IRST UTC+03:30 → BDST UTC+06:00). The shared working window is 9:00 AM–2:30 PM IRST. 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 Tehran and Dhaka?
Tehran (IRST, UTC+03:30) is 2 hours 30 minutes ahead of Dhaka (BDST, UTC+06:00). The gap is currently +2h 30m.
How do I convert Tehran time to Dhaka time?
Add +2h 30m to Tehran local time. For example, 9:00 AM in Tehran is 11:30 AM in Dhaka.
What time is it in Dhaka right now?
Dhaka uses BDST at UTC+06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +2h 30m offset from Tehran.
What is the best time to call Dhaka from Tehran?
Call between 9:00 AM and 2:30 PM IRST — that maps to 11:30 AM–5:00 PM BDST and keeps both parties inside the working day.
Which is ahead, Tehran or Dhaka?
Tehran is 2 hours 30 minutes ahead of Dhaka. When it is 12:00 PM in Tehran it is 2:30 PM in Dhaka.
Do Tehran and Dhaka use different time zones?
Tehran (Iran) uses IRST at UTC+03:30, while Dhaka (Bangladesh) uses BDST at UTC+06:00. The IANA identifiers are Asia/Tehran and Asia/Dhaka.
Does daylight saving time affect the Tehran–Dhaka difference?
Neither zone observes daylight saving time, so the +2h 30m offset between Tehran and Dhaka is fixed all year.
Which other cities share Tehran's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, Tehran's zone?
IRST is used in Iran.
Is there a day difference between Tehran and Dhaka?
Not normally. The +2h 30m gap only pushes the date over for late-evening times.
What is the time difference between Tehran and Dhaka?
Dhaka is +2h 30m from Tehran.
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 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 are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What are the business hours in Dhaka?
Standard business hours in Dhaka are 9:00 AM - 5:00 PM BST.
What is the best time to schedule a call between Tehran and Dhaka?
The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and Dhaka works 9:00 AM - 5:00 PM BST (+2h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Tehran and Dhaka?
Tehran uses IRR (﷼) while Dhaka uses BDT (৳). Check current exchange rates when planning travel or business between these cities.
How do Tehran and Dhaka compare in size?
Tehran has a population of approximately 9.4 million (metro: 16.8 million), while Dhaka has approximately 10.3 million (metro: 22.5 million).
What are the major landmarks in Tehran and Dhaka?
Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. Dhaka is famous for Lalbagh Fort, Ahsan Manzil, National Parliament House.
Do Tehran and Dhaka have stock exchanges?
Yes. Tehran has the TSE (Tehran Stock Exchange) and Dhaka has the DSE (Dhaka Stock Exchange). The +2h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting facts about IRST?
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).
Which cities are in the BDST timezone?
Major cities in the BDST timezone include Dhaka, Chittagong, Khulna, Rajshahi, Sylhet.
What is the UTC offset for BDST?
Bangladesh Standard Time (BDST) is at UTC+06:00.
What should I know about the BDST timezone?
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.
When is it midnight in Tehran, what time is it in Dhaka?
When it is 12:00 AM (midnight) in Tehran (IRST), it is +2h 30m later in Dhaka (BDST).
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