JST to AKST Converter
Convert time between Japan Standard Time (JST) and Alaska Standard Time (AKST)
Japan Standard Time (JST)
Alaska Standard Time (AKST)
Time Difference
Alaska Standard Time (AKST) is 0 hours ahead of Japan Standard Time (JST)
Select Date
Select Time
Quick Reference
| JST | AKST |
|---|---|
| 11:00 | 17:00 |
| 13:00 | 19:00 |
| 15:00 | 21:00 |
| 17:00 | 23:00 |
| 19:00 | 01:00 |
| 21:00 | 03:00 |
| 23:00 | 05:00 |
| 01:00 | 07:00 |
| 03:00 | 09:00 |
| 05:00 | 11:00 |
| 07:00 | 13:00 |
| 09:00 | 15:00 |
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 AKST Time Conversion
Converting time between Japan Standard Time (JST) and Alaska Standard Time (AKST) is essential for Japan to Alaska coordination during the winter months. JST is UTC+9 while AKST is UTC-9, making JST 18 hours ahead of AKST. Japan does not observe daylight saving time, so JST remains constant year-round. Alaska observes daylight saving time from early November to mid-March using AKST (UTC-9). From mid-March to early November, the region uses AKDT (UTC-8), which decreases the difference to 17 hours.
This conversion is crucial for business operations between Japan and Alaska. Whether you're scheduling international meetings, coordinating between Tokyo and Anchorage, 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 JST to AKST Conversion
Business & Work
- Scheduling Japan to Alaska business meetings during winter months
- Coordinating Tokyo and Anchorage corporate operations
- Managing global business operations between Japan and Alaska during November-March
Personal & Travel
- Planning travel from Japan to Alaska during winter
- Coordinating with Alaska family and friends from Japan
- Scheduling virtual events for Japan-Alaska audiences during winter
Time Zone Information
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
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
Quick Reference: JST to AKST
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 JST and AKST?
Japan Standard Time (JST) is UTC+9, while Alaska Standard Time (AKST) is UTC-9. JST is 18 hours ahead of AKST. This means when it's 6:00 PM JST, it's 12:00 AM AKST the same day.
How does the JST to AKST offset differ from JST to AKDT?
Alaska Standard Time (AKST) is UTC-9 used during winter, while Alaska Daylight Time (AKDT) is UTC-8 used during summer daylight saving. Since JST is 18 hours ahead of AKST, it's 17 hours ahead of AKDT. Alaska transitions from AKST to AKDT in mid-March and back to AKST in early November.
Does Japan observe daylight saving time like AKST does?
No, Japan does not observe daylight saving time. Japan Standard Time (JST) remains UTC+9 year-round. Alaska observes 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 with Japan varies between 17 hours (AKDT period) and 18 hours (AKST period).
What major cities are in JST and AKST timezones?
JST covers all major Japanese cities including Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka, and Kobe. AKST covers major Alaskan cities including Anchorage, Juneau, and Fairbanks during winter months (November-March).
How do I convert JST to AKST manually?
To convert from JST to AKST, subtract 18 hours from the JST time. For example, if it's 3:00 PM (15:00) JST, subtract 18 hours to get 9:00 PM AKST the previous day. Remember that when AKST ends and AKDT begins (mid-March), subtract 17 hours instead of 18.
What should I know about scheduling across JST and AKST?
Japan is 18 hours ahead of Alaska during winter (AKST period). Morning JST (8-10 AM) corresponds to evening AKST (2-4 PM previous day), while late afternoon JST (4-6 PM) aligns with morning AKST (10 AM-12 PM). Evening JST (6-8 PM) offers good overlap with late morning AKST (12-2 PM). Schedule important meetings during the evening JST / midday AKST window for best results.
Pro Tips
- • JST is always 18 hours ahead of AKST during winter months (November-March).
- • Japan does not observe daylight saving time, so JST is consistent while AKST transitions to AKDT.
- • Evening JST (6-8 PM) equals midday AKST (12-2 PM), providing the best overlap for real-time communication.
- • Morning JST (8-10 AM) equals evening AKST (2-4 PM previous day), making those times 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.