AKDT to AST Converter
Convert time between Alaska Daylight Time (AKDT) and Atlantic Standard Time (AST)
Alaska Daylight Time (AKDT)
Atlantic Standard Time (AST)
Time Difference
Atlantic Standard Time (AST) is 0 hours ahead of Alaska Daylight Time (AKDT)
Select Date
Select Time
Quick Reference
| AKDT | AST |
|---|---|
| 18:00 | 23:00 |
| 20:00 | 01:00 |
| 22:00 | 03:00 |
| 00:00 | 05:00 |
| 02:00 | 07:00 |
| 04:00 | 09:00 |
| 06:00 | 11:00 |
| 08:00 | 13:00 |
| 10:00 | 15:00 |
| 12:00 | 17:00 |
| 14:00 | 19:00 |
| 16:00 | 21:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About AKDT to AST Time Conversion
Converting time between Alaska Daylight Time (AKDT) and Atlantic Standard Time (AST) connects two far-flung corners of North America. AKDT is UTC-8 (observed during daylight saving in Alaska from March to November), while AST is UTC-4, making AST 4 hours ahead of AKDT. This puts Atlantic Canada well into the evening when Alaska is still in the afternoon.
This time zone converter uses the IANA timezone database for accurate calculations. Note that this conversion applies seasonally — Alaska observes AKDT only during daylight saving time (mid-March to early November), while Atlantic Canada observes AST during its standard time period (November to March). Confirming which offsets are currently active is important for precise scheduling.
Common Use Cases for AKDT to AST Conversion
Business & Work
- Scheduling meetings between Anchorage-based teams and Atlantic Canada offices
- Coordinating project deadlines across Alaska and the Maritime provinces
- Planning conference calls and webinars between Alaska and Halifax or Saint John
Personal & Travel
- Staying in touch with family and friends in Atlantic Canada from Alaska during summer
- Planning travel itineraries between Alaska and the Canadian Maritime provinces
- Scheduling virtual events and online activities across the AKDT and AST time zones
Time Zone Information
Alaska Daylight Time (AKDT)
- UTC Offset: UTC-8
- IANA Timezone: America/Anchorage
- Daylight Saving: AKDT is the daylight saving version of AKST; observed second Sunday in March to first Sunday in November
- Major Cities: Anchorage, Fairbanks, Juneau, Sitka, Ketchikan
- Coverage: Covers most of the state of Alaska, USA, during daylight saving time
Atlantic Standard Time (AST)
- UTC Offset: UTC-4 (UTC-3 during ADT)
- IANA Timezone: America/Halifax
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Halifax, Saint John, Moncton, Charlottetown, Fredericton
- Coverage: Covers Canada's Atlantic provinces including Nova Scotia, New Brunswick, Prince Edward Island, and parts of Quebec
Quick Reference: AKDT to AST
Remember: AST is always 4 hours ahead of AKDT
Frequently Asked Questions
What is the time difference between AKDT and AST?
Alaska Daylight Time (AKDT) is UTC-8, while Atlantic Standard Time (AST) is UTC-4. AST is 4 hours ahead of AKDT. When it's 12:00 PM in Anchorage, it's 4:00 PM in Halifax.
When does the AKDT to AST conversion apply?
This specific pairing applies when Alaska is observing daylight saving time (AKDT, mid-March to early November) and Atlantic Canada is on standard time (AST, November to March). Outside these windows, the offset between the two regions differs — Alaska reverts to AKST (UTC-9) and Atlantic Canada may switch to ADT (UTC-3).
How does the time difference change throughout the year?
During North American summer, when Alaska is on AKDT (UTC-8) and Atlantic Canada is on ADT (UTC-3), the difference remains 5 hours. When Alaska is on AKST (UTC-9) and Atlantic Canada is on AST (UTC-4), the difference is also 5 hours. The 4-hour AKDT-to-AST gap only applies during the brief seasonal overlap periods.
What are the best times for AKDT to AST business calls?
Alaska business hours (9:00 AM–5:00 PM AKDT) overlap with Atlantic Canada's afternoon (1:00 PM–9:00 PM AST). The sweet spot for live collaboration is 9:00 AM–1:00 PM AKDT, which corresponds to 1:00 PM–5:00 PM AST — fully within business hours for both sides.
Which regions use AST (Atlantic Standard Time)?
AST (UTC-4) is observed in Canada's Atlantic provinces: Nova Scotia, New Brunswick, Prince Edward Island, and the Magdalen Islands of Quebec. Parts of the Caribbean including Puerto Rico, the US Virgin Islands, and several island nations also use UTC-4 year-round.
Which regions use AKDT (Alaska Daylight Time)?
AKDT (UTC-8) is observed across most of Alaska during daylight saving time, from the second Sunday in March to the first Sunday in November. Major cities include Anchorage, Fairbanks, and Juneau. The Aleutian Islands west of 169.5°W use a different offset (Hawaii-Aleutian time), so they are not included in AKDT.
Pro Tips
- • AST is 4 hours ahead of AKDT — simply add 4 hours to any AKDT time to get the AST equivalent, rolling over to the next day after 8:00 PM AKDT.
- • The best overlap window for real-time collaboration is 9:00 AM–1:00 PM AKDT, aligning with 1:00 PM–5:00 PM AST — fully in business hours for both regions.
- • AKDT is only active from mid-March to early November; outside this window Alaska is on AKST (UTC-9), which widens the gap to 5 hours from AST.
- • Atlantic Canada observes ADT (UTC-3) during its own daylight saving period (March–November), which also shifts the difference — always verify current offsets before scheduling.
- • When setting up recurring meetings across AKDT and AST, build in a calendar review at each DST transition to avoid time drift.
- • Alaska and Atlantic Canada share the same continent but sit at opposite ends — a 4-hour gap makes same-day coordination quite achievable compared to trans-Pacific schedules.