JST to AKDT Converter
Convert time between Japan Standard Time (JST) and Alaska Daylight Time (AKDT)
Japan Standard Time (JST)
Alaska Daylight Time (AKDT)
Time Difference
Alaska Daylight Time (AKDT) is 0 hours ahead of Japan Standard Time (JST)
Select Date
Select Time
Quick Reference
| JST | AKDT |
|---|---|
| 11:00 | 18:00 |
| 13:00 | 20:00 |
| 15:00 | 22:00 |
| 17:00 | 00:00 |
| 19:00 | 02:00 |
| 21:00 | 04:00 |
| 23:00 | 06:00 |
| 01:00 | 08:00 |
| 03:00 | 10:00 |
| 05:00 | 12:00 |
| 07:00 | 14:00 |
| 09:00 | 16:00 |
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 JST to AKDT Time Conversion
Converting time between Japan Standard Time (JST) and Alaska Daylight Time (AKDT) bridges Tokyo, Osaka, Kyoto, and the rest of Japan with Anchorage and Fairbanks. JST is UTC+9 while AKDT is UTC-8, placing AKDT 17 hours behind JST — almost a full day difference that nearly always shifts conversions onto the previous 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 JST and AKST.
Common Use Cases for JST to AKDT Conversion
Business & Work
- Scheduling meetings between Japanese partners and Alaska-based teams
- Coordinating fishing, seafood, and energy industry projects between Japan and Alaska
- Planning conference calls between Tokyo or Osaka and Anchorage
Personal & Travel
- Planning travel itineraries between Japan and Alaska
- Coordinating with family and friends in Alaska from Japan
- Scheduling virtual events for JST and AKDT audiences
Time Zone Information
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
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
Quick Reference: JST to AKDT
Remember: AKDT is always 17 hours behind JST during Alaska's daylight saving period
Frequently Asked Questions
What is the time difference between JST and AKDT?
Japan Standard Time (JST) is UTC+9, while Alaska Daylight Time (AKDT) is UTC-8. AKDT is 17 hours behind JST. When it is 12:00 PM in Tokyo, it is 7:00 PM the previous day in Anchorage.
When does this JST to AKDT 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 JST-AKDT business calls?
Early morning in Tokyo (9:00 AM JST) is 4:00 PM the previous day in Anchorage — 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 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.
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.
Pro Tips
- • AKDT is 17 hours behind JST — subtract 17 hours from a Tokyo time to get the Anchorage time.
- • Most JST to AKDT conversions cross into the previous calendar day in Alaska.
- • Best meeting window: 9:00–11:00 AM JST overlaps with 4:00–6:00 PM previous-day AKDT.
- • Japan does not observe DST. Only the AKDT side shifts; JST is constant year-round at UTC+9.
- • Use IANA identifiers (Asia/Tokyo and America/Anchorage) in calendar tools to handle DST transitions automatically.
- • When Alaska reverts to AKST in November, the offset to Tokyo becomes 18 hours.