AST to BDST
+10hAST
ASTSOURCEBDST
BDSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and BDST on the World Map
The map below highlights the AST (Atlantic Standard Time) and BDST (Bangladesh Standard Time) timezone regions across the globe.
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.
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).
Everything You Need to Know About AST and BDST Time
AST runs on Atlantic Standard Time (AST) at UTC-04:00. BDST runs on Bangladesh Standard Time (BDST) at UTC+06:00. That puts AST 10 hours ahead of BDST — a difference of +10h at the current offsets.
In practice, when it is 9:00 AM in AST it is 7:00 PM in BDST. Midnight in AST is 10:00 AM in BDST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to BDST time conversion table
| AST (AST) | BDST (BDST) | Day |
|---|---|---|
| 12:00 AM | 10:00 AM | same day |
| 6:00 AM | 4:00 PM | same day |
| 7:00 AM | 5:00 PM | same day |
| 8:00 AM | 6:00 PM | same day |
| 9:00 AM | 7:00 PM | same day |
| 12:00 PM | 10:00 PM | same day |
| 3:00 PM | 1:00 AM | next day |
| 5:00 PM | 3:00 AM | next day |
| 6:00 PM | 4:00 AM | next day |
| 9:00 PM | 7:00 AM | next day |
Why people convert AST to BDST time
- Scheduling a call from AST to BDST: a 10:00 AM start in AST lands at 8:00 PM in BDST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +10h gap: AST and BDST 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 BDST is 7:00 PM in AST.
- Coordinating a AST-based team with BDST 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 AST" 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 AST takes the early slot, the next week BDST does.
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.
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 AST and BDST
With a +10h offset there is no overlap inside a normal 9 AM – 5 PM day. BDST opens at 9:00 AM BDST, which is 7:00 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and BDST have no shared working hours because of the +10h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 10 hours ahead of BDST (AST UTC-04:00 → BDST UTC+06:00). 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
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
BDST
Does not observe DST
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 AST and BDST?
AST (AST, UTC-04:00) is 10 hours ahead of BDST (BDST, UTC+06:00). The gap is currently +10h.
How do I convert AST time to BDST time?
Add +10h to AST local time. For example, 9:00 AM in AST is 7:00 PM in BDST.
What time is it in BDST right now?
BDST 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 +10h offset from AST.
What is the best time to call BDST from AST?
There is no shared working-hours window because of the +10h gap. The closest option is 1:00 PM in AST, which is 11:00 PM in BDST.
Which is ahead, AST or BDST?
AST is 10 hours ahead of BDST. When it is 12:00 PM in AST it is 10:00 PM in BDST.
Does daylight saving time affect the AST–BDST difference?
Neither zone observes daylight saving time, so the +10h offset between AST and BDST is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and BDST?
Not normally. The +10h gap only pushes the date over for late-evening times.
What is the time difference between AST and BDST?
BDST is +10h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is BDST in?
BDST operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 AST, what time is it in BDST?
When it is 12:00 AM (midnight) in AST (AST), it is +10h later in BDST (BDST).
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See every conversion from AST →·See every conversion from BDST →