Dhaka to Tehran Time
BST to IRST Converter — 9 AM BST is 6:30 AM IRST
Dhaka is 2 hours and 30 minutes ahead of Tehran. Convert any time between Dhaka (BST) and Tehran (IRST/IRDT) instantly.
Dhaka
Bangladesh
Tehran
Iran
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Time Zone Comparison
Dhaka to Tehran Time Conversion Table
| Dhaka (BST) | Tehran (IRST) |
|---|---|
| 12:00 AM | 9:30 PM |
| 2:00 AM | 11:30 PM |
| 4:00 AM | 1:30 AM |
| 6:00 AM | 3:30 AM |
| 8:00 AM | 5:30 AM |
| 10:00 AM | 7:30 AM |
| 12:00 PM | 9:30 AM |
| 2:00 PM | 11:30 AM |
| 4:00 PM | 1:30 PM |
| 6:00 PM | 3:30 PM |
| 8:00 PM | 5:30 PM |
| 10:00 PM | 7:30 PM |
Dhaka & Tehran — Business & Scheduling Guide
Dhaka (Bangladesh) is an important regional economy, with key industries in diverse sectors including services and trade. Tehran (Iran) is an important regional economy, known for diverse sectors including services and trade. With a 2.5-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Dhaka and Tehran
With only a 2.5-hour gap, Dhaka and Tehran have generous overlapping work hours. Morning calls in the earlier time zone align well with mid-day in the other. Business hours typically follow a 9 AM–5 PM schedule. Business hours typically follow a 9 AM–5 PM schedule. Most teams find that late morning to early afternoon offers the widest window for collaboration.
Daylight Saving Time Considerations
Tehran observes Daylight Saving Time (IRST/IRDT), while Dhaka stays on BST year-round. When Tehran switches to daylight time, the effective time difference shifts by 1 hour. This typically happens in spring and fall, and the exact dates vary by country. If you have recurring cross-timezone meetings, recalculate the schedule after each DST transition.
BST to IRST — Quick Reference
BST (BST) stands for the timezone used in Dhaka, Bangladesh (UTC+6). IRST (IRST/IRDT) is the timezone used in Tehran, Iran (UTC+3:30). Dhaka is 2 hours and 30 minutes ahead of Tehran.
To convert BST to IRST, subtract 2.5 hours from BST time. For example, BST 9:00 AM = IRST 6:30 AM.
Key Facts
- •Time difference: Dhaka (UTC+6) is 2 hours and 30 minutes ahead of Tehran (UTC+3:30).
- •Daylight Saving Time: Dhaka does not observe DST (BST). Tehran observes DST (IRST/IRDT).
- •Regions: Dhaka is located in Bangladesh and uses the BST time zone. Tehran is located in Iran and uses the IRST/IRDT time zone.
- •Best time to call: The best time to call between Dhaka and Tehran is 12:00 PM to 4:00 PM in Dhaka time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Dhaka and Tehran?
Dhaka is 2 hours and 30 minutes ahead of Tehran.
What time is it in Tehran when it's 9 AM in Dhaka?
When it's 9:00 AM in Dhaka, it is 6:30 AM in Tehran.
What time is 9 PM BST in IRST?
9 PM BST (Dhaka time) is 6:30 PM IRST (Tehran time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Dhaka and Tehran?
The best time to schedule a meeting is between 12:00 PM to 4:00 PM in Dhaka time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert BST to IRST?
BST (BST) is the timezone for Dhaka, Bangladesh (UTC+6). IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). Dhaka is 2 hours and 30 minutes ahead of Tehran. Quick examples: 9 AM BST = 6:30 AM IRST, 12 PM BST = 9:30 AM IRST, 3 PM BST = 12:30 PM IRST, 6 PM BST = 3:30 PM IRST.
Is Dhaka ahead of or behind Tehran?
Dhaka is 2 hours 30 minutes ahead of Tehran. When it's noon in Dhaka, it's 9:30 AM in Tehran.
Does Dhaka or Tehran change clocks for Daylight Saving Time?
No, Dhaka does not observe DST — it stays on BST year-round. Tehran observes DST and switches between IRST/IRDT. Because only one city observes DST, the time difference shifts by 1 hour during transition periods (typically March/April and October/November).
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