Tehran to Dhaka Time
IRST to BST Converter — 9 AM IRST is 11:30 AM BST
Tehran is 2 hours and 30 minutes behind Dhaka. Convert any time between Tehran (IRST/IRDT) and Dhaka (BST) instantly.
Tehran
Iran
Dhaka
Bangladesh
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Time Zone Comparison
Tehran to Dhaka Time Conversion Table
| Tehran (IRST) | Dhaka (BST) |
|---|---|
| 12:00 AM | 2:30 AM |
| 2:00 AM | 4:30 AM |
| 4:00 AM | 6:30 AM |
| 6:00 AM | 8:30 AM |
| 8:00 AM | 10:30 AM |
| 10:00 AM | 12:30 PM |
| 12:00 PM | 2:30 PM |
| 2:00 PM | 4:30 PM |
| 4:00 PM | 6:30 PM |
| 6:00 PM | 8:30 PM |
| 8:00 PM | 10:30 PM |
| 10:00 PM | 12:30 AM |
Tehran & Dhaka — Business & Scheduling Guide
Tehran (Iran) is an important regional economy, with key industries in diverse sectors including services and trade. Dhaka (Bangladesh) 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 Tehran and Dhaka
With only a 2.5-hour gap, Tehran and Dhaka have generous overlapping work hours. Morning calls in the later 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), but Dhaka does not — it stays on BST year-round. This means the time difference between Tehran and Dhaka changes by 1 hour when Tehran switches clocks. During Iran's summer, the gap is 1.5–3.5 hours instead of the standard 2.5 hours. Mark DST transition dates on your calendar to avoid missed meetings.
IRST to BST — Quick Reference
IRST (IRST/IRDT) stands for the timezone used in Tehran, Iran (UTC+3:30). BST (BST) is the timezone used in Dhaka, Bangladesh (UTC+6). Tehran is 2 hours and 30 minutes behind Dhaka.
To convert IRST to BST, add 2.5 hours to IRST time. For example, IRST 9:00 AM = BST 11:30 AM.
Key Facts
- •Time difference: Tehran (UTC+3:30) is 2 hours and 30 minutes behind Dhaka (UTC+6).
- •Daylight Saving Time: Tehran observes DST (IRST/IRDT). Dhaka does not observe DST (BST).
- •Regions: Tehran is located in Iran and uses the IRST/IRDT time zone. Dhaka is located in Bangladesh and uses the BST time zone.
- •Best time to call: The best time to call between Tehran and Dhaka is 9:00 AM to 2:00 PM in Tehran time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Tehran and Dhaka?
Tehran is 2 hours and 30 minutes behind Dhaka.
What time is it in Dhaka when it's 9 AM in Tehran?
When it's 9:00 AM in Tehran, it is 11:30 AM in Dhaka.
What time is 9 PM IRST in BST?
9 PM IRST (Tehran time) is 11:30 PM BST (Dhaka 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 Tehran and Dhaka?
The best time to schedule a meeting is between 9:00 AM to 2:00 PM in Tehran 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 IRST to BST?
IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). BST (BST) is the timezone for Dhaka, Bangladesh (UTC+6). Tehran is 2 hours and 30 minutes behind Dhaka. Quick examples: 9 AM IRST = 11:30 AM BST, 12 PM IRST = 2:30 PM BST, 3 PM IRST = 5:30 PM BST, 6 PM IRST = 8:30 PM BST.
Is Tehran ahead of or behind Dhaka?
Tehran is 2 hours 30 minutes behind Dhaka. When it's noon in Tehran, it's 2:30 PM in Dhaka.
Does Tehran or Dhaka change clocks for Daylight Saving Time?
Yes, Tehran observes DST and switches between IRST/IRDT. Dhaka does not observe DST — it stays on BST year-round. 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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