AKST to JST Converter
Convert time between Alaska Standard Time (AKST) and Japan Standard Time (JST)
Alaska Standard Time (AKST)
Japan Standard Time (JST)
Time Difference
Japan Standard Time (JST) is 0 hours ahead of Alaska Standard Time (AKST)
Select Date
Select Time
Quick Reference
| AKST | JST |
|---|---|
| 17:00 | 11:00 |
| 19:00 | 13:00 |
| 21:00 | 15:00 |
| 23:00 | 17:00 |
| 01:00 | 19:00 |
| 03:00 | 21:00 |
| 05:00 | 23:00 |
| 07:00 | 01:00 |
| 09:00 | 03:00 |
| 11:00 | 05:00 |
| 13:00 | 07:00 |
| 15:00 | 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 AKST to JST Time Conversion
Converting time from Alaska Standard Time (AKST) to Japan Standard Time (JST) is essential for Alaska to Japan coordination during the winter months. AKST is UTC-9 while JST is UTC+9, making JST 18 hours ahead of AKST. Alaska observes daylight saving time from early November to mid-March using AKST (UTC-9). From mid-March to early November, they use AKDT (UTC-8), which decreases the difference to 17 hours. Japan does not observe daylight saving time, so JST remains constant year-round at UTC+9.
This conversion is crucial for business operations between Alaska and Japan during winter months. Whether you're scheduling international meetings, coordinating between Anchorage and Tokyo, managing customer service operations, or coordinating with business partners across both regions, our accurate IANA-based converter ensures precise timezone calculations.
Common Use Cases for AKST to JST Conversion
Business & Work
- Scheduling Alaska to Japan business meetings during winter months
- Coordinating Anchorage and Tokyo corporate operations
- Managing global business operations between Alaska and Japan during November-March
Personal & Travel
- Planning travel from Alaska to Japan during winter
- Coordinating with Japan family and friends from Alaska
- Scheduling virtual events for Alaska-Japan audiences during winter
Time Zone Information
Alaska Standard Time (AKST)
- UTC Offset: UTC-9
- IANA Timezone: America/Anchorage
- Daylight Saving: Early November to mid-March
- Major Cities: Anchorage, Juneau, Fairbanks
- Coverage: Alaska during winter
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: None - JST is standard time year-round
- Major Cities: Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka
- Coverage: All of Japan
Quick Reference: AKST to JST
Remember: JST is always 18 hours ahead of AKST during winter (November-March). When AKST ends and AKDT begins, the difference becomes 17 hours.
Frequently Asked Questions
What is the time difference between AKST and JST?
Alaska Standard Time (AKST) is UTC-9, while Japan Standard Time (JST) is UTC+9. JST is 18 hours ahead of AKST, meaning AKST is 18 hours behind JST. When it's 12:00 AM AKST, it's 6:00 PM JST the same day.
How does the AKST to JST offset differ from AKDT to JST?
Alaska Standard Time (AKST) is UTC-9 used during winter, while Alaska Daylight Time (AKDT) is UTC-8 used during summer. Since JST is 18 hours ahead of AKST, it's 17 hours ahead of AKDT. Alaska transitions from AKDT to AKST in early November and back to AKDT in mid-March.
Does Alaska observe daylight saving time like Japan does?
No, Japan does not observe daylight saving time. Alaska does observe daylight saving time, using AKST (UTC-9) from early November to mid-March and AKDT (UTC-8) from mid-March to early November. This means the time difference between Alaska and Japan varies between 17 hours (AKDT period) and 18 hours (AKST period).
What major cities are in AKST and JST timezones?
AKST covers major Alaskan cities including Anchorage, Juneau, and Fairbanks during winter months (November-March). JST covers all major Japanese cities including Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka, and Kobe year-round.
How do I convert AKST to JST manually?
To convert from AKST to JST, add 18 hours to the AKST time. For example, if it's 12:00 AM AKST, add 18 hours to get 6:00 PM JST the same day. Remember that when AKST transitions to AKDT (mid-March), you'll add 17 hours instead of 18.
What should I know about scheduling across AKST and JST?
Alaska is 18 hours behind Japan during winter (AKST period). Morning AKST (8-10 AM) corresponds to late night/early morning JST (2-4 AM next day), while late morning AKST (10 AM-12 PM) aligns with night-time JST (4-6 AM next day). Afternoon AKST (2-4 PM) reaches morning JST (8-10 AM next day), providing good overlap. Late afternoon AKST (4-6 PM) offers mid-morning JST (10 AM-12 PM next day) for the best real-time communication window.
Pro Tips
- • AKST is always 18 hours behind JST during the winter period (November-March).
- • Japan does not observe daylight saving time, so JST is consistent while AKST transitions to AKDT.
- • Afternoon AKST (2-4 PM) equals morning JST (8-10 AM next day), providing the best overlap for real-time communication.
- • Morning AKST (8-10 AM) equals late night JST (2-4 AM next day), making it less suitable for business coordination.
- • When Alaska transitions from AKST to AKDT (mid-March), the time difference decreases from 18 to 17 hours.
- • Use the converter during daylight saving transitions to ensure accurate scheduling when AKST changes to AKDT.