Dhaka to AST
-10hDhaka
BDSTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
BDST and AST on the World Map
The map below highlights the BDST (Bangladesh Standard Time) and AST (Atlantic 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).
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
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.
Dhaka to AST Time Difference – Complete Guide
Dhaka runs on Bangladesh Standard Time (BDST) at UTC+06:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Dhaka 10 hours behind AST — a difference of -10h at the current offsets.
In practice, when it is 9:00 AM in Dhaka it is 11:00 PM in AST on the previous day. Midnight in Dhaka is 2:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Dhaka to AST time conversion table
| Dhaka (BDST) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 2:00 PM | previous day |
| 6:00 AM | 8:00 PM | previous day |
| 7:00 AM | 9:00 PM | previous day |
| 8:00 AM | 10:00 PM | previous day |
| 9:00 AM | 11:00 PM | previous day |
| 12:00 PM | 2:00 AM | same day |
| 3:00 PM | 5:00 AM | same day |
| 5:00 PM | 7:00 AM | same day |
| 6:00 PM | 8:00 AM | same day |
| 9:00 PM | 11:00 AM | same day |
Why people convert Dhaka to AST time
- Scheduling a call from Dhaka to AST: a 10:00 AM start in Dhaka lands at 12:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -10h gap: Dhaka and AST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AST is 11:00 PM in Dhaka.
- Keeping family and friends in sync: knowing that 8:00 PM in Dhaka is 10:00 AM in AST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM BDST" is unambiguous; "3 PM" across a -10h gap is not.
- With a -10h gap there is no shared 9-to-5 window, so alternate the early start: one week Dhaka takes the early slot, the next week AST does.
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 AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
Best time to call between Dhaka and AST
With a -10h offset there is no overlap inside a normal 9 AM – 5 PM day. AST opens at 9:00 AM AST, which is 11:00 PM in Dhaka, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Dhaka and AST have no shared working hours because of the -10h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Dhaka is 10 hours behind AST (BDST UTC+06:00 → AST UTC-04:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Dhaka
Does not observe DST
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
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 AST?
Dhaka (BDST, UTC+06:00) is 10 hours behind AST (AST, UTC-04:00). The gap is currently -10h.
How do I convert Dhaka time to AST time?
Add -10h to Dhaka local time. For example, 9:00 AM in Dhaka is 11:00 PM in AST (previous day).
What time is it in AST right now?
AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -10h offset from Dhaka.
What is the best time to call AST from Dhaka?
There is no shared working-hours window because of the -10h gap. The closest option is 1:00 PM in Dhaka, which is 3:00 AM in AST.
Which is behind, Dhaka or AST?
Dhaka is 10 hours behind AST. When it is 12:00 PM in Dhaka it is 2:00 AM in AST.
Do Dhaka and AST use different time zones?
Dhaka (Bangladesh) uses BDST at UTC+06:00, while AST uses AST at UTC-04:00. The IANA identifiers are Asia/Dhaka and America/Halifax.
Does daylight saving time affect the Dhaka–AST difference?
Neither zone observes daylight saving time, so the -10h offset between Dhaka and AST 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 AST?
Not normally. The -10h gap only pushes the date over the previous day.
What is the time difference between Dhaka and AST?
AST is -10h 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 AST in?
AST operates on its local timezone.
What are the business hours in Dhaka?
Standard business hours in Dhaka are 9:00 AM - 5:00 PM BST.
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 AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in Dhaka, what time is it in AST?
When it is 12:00 AM (midnight) in Dhaka (BDST), it is -10h later in AST (AST).
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