AKDT to JST Converter
Convert time between Alaska Daylight Time (AKDT) and Japan Standard Time (JST)
Alaska Daylight Time (AKDT)
Japan Standard Time (JST)
Time Difference
Japan Standard Time (JST) is 0 hours ahead of Alaska Daylight Time (AKDT)
Select Date
Select Time
Quick Reference
| AKDT | JST |
|---|---|
| 18:00 | 11:00 |
| 20:00 | 13:00 |
| 22:00 | 15:00 |
| 00:00 | 17:00 |
| 02:00 | 19:00 |
| 04:00 | 21:00 |
| 06:00 | 23:00 |
| 08:00 | 01:00 |
| 10:00 | 03:00 |
| 12:00 | 05:00 |
| 14:00 | 07:00 |
| 16:00 | 09:00 |
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 JST Time Conversion
Converting time between Alaska Daylight Time (AKDT) and Japan Standard Time (JST) bridges Anchorage and Fairbanks with Tokyo, Osaka, Kyoto, and the rest of Japan. AKDT is UTC-8 while JST is UTC+9, placing JST 17 hours ahead of AKDT — almost a full day difference that nearly always shifts conversions onto the next calendar day.
This converter uses the IANA timezone database for accurate calculations. Japan does not observe daylight saving time, so JST is constant year-round. AKDT is in effect from March to November; the 17-hour offset applies during that window. After DST ends, the offset becomes 18 hours between AKST and JST.
Common Use Cases for AKDT to JST Conversion
Business & Work
- Scheduling meetings between Alaska-based teams and Japanese partners
- Coordinating fishing, seafood, and energy industry projects between Alaska and Japan
- Planning conference calls between Anchorage and Tokyo or Osaka
Personal & Travel
- Planning travel itineraries between Alaska and Japan
- Coordinating with family and friends in Japan
- Scheduling virtual events for AKDT and JST audiences
Time Zone Information
Alaska Daylight Time (AKDT)
- UTC Offset: UTC-8
- IANA Timezone: America/Anchorage
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Anchorage, Fairbanks, Juneau, Sitka
- Coverage: Most of Alaska during daylight saving period
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: Japan does not observe daylight saving time
- Major Cities: Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Fukuoka, Kyoto
- Coverage: Japan year-round
Quick Reference: AKDT to JST
Remember: JST is always 17 hours ahead of AKDT during Alaska's daylight saving period
Frequently Asked Questions
What is the time difference between AKDT and JST?
Alaska Daylight Time (AKDT) is UTC-8, while Japan Standard Time (JST) is UTC+9. JST is 17 hours ahead of AKDT. When it is 12:00 PM in Anchorage, it is 5:00 AM the next day in Tokyo.
When does this AKDT to JST conversion apply?
AKDT runs from the second Sunday in March to the first Sunday in November. Japan does not observe DST and stays on JST year-round. The 17-hour offset applies during Alaska's DST window.
How does the time difference change throughout the year?
When Alaska reverts to AKST (UTC-9) in November, the offset to JST grows to 18 hours. JST itself never changes — Japan does not observe daylight saving.
What are the best times for AKDT-JST business calls?
Late afternoon in Anchorage (4:00 PM AKDT) is 9:00 AM the next day in Tokyo — workable for both sides. The 17-hour gap leaves narrow live overlap, so most coordination happens at the edges of each working day or asynchronously.
Which countries/regions use JST timezone?
JST is observed in Japan year-round. Major cities include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Fukuoka, and Kyoto. South Korea uses KST with the same UTC+9 offset.
Which countries/regions use AKDT timezone?
AKDT covers most of Alaska during daylight saving, including Anchorage, Fairbanks, Juneau, and Sitka. The Aleutian Islands use Hawaii-Aleutian Time and follow a different rule set.
Pro Tips
- • JST is 17 hours ahead of AKDT — add 17 hours to an Anchorage time to get the Tokyo time.
- • Almost every AKDT to JST conversion crosses into the next calendar day in Japan.
- • Best meeting window: 4:00–6:00 PM AKDT overlaps with 9:00–11:00 AM next-day JST.
- • Japan does not observe DST. Only the AKDT side shifts; JST is constant year-round at UTC+9.
- • Use IANA identifiers (America/Anchorage and Asia/Tokyo) in calendar tools to handle DST transitions automatically.
- • When Alaska reverts to AKST in November, the offset to Tokyo becomes 18 hours.