JST to AKST
-18hJST
JSTSOURCEAKST
AKSTGreen rows indicate typical business hours (9 AM - 5 PM)
JST and AKST on the World Map
The map below highlights the JST (Japan Standard Time) and AKST (Alaska Standard Time) timezone regions across the globe.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
AKST – Alaska Standard Time
UTC-09:00Alaska Standard Time (AKST) is the time zone for the state of Alaska, 9 hours behind UTC.
- •Alaska is the largest US state by area but has only about 730,000 residents.
- •Anchorage is the most populous city in AKST with about 290,000 people.
- •The Aleutian Islands use HAST instead of AKST.
Time Conversion Guide: JST to AKST
JST runs on Japan Standard Time (JST) at UTC+09:00. AKST runs on Alaska Standard Time (AKST) at UTC-09:00. That puts JST 18 hours behind AKST — a difference of -18h at the current offsets.
In practice, when it is 9:00 AM in JST it is 3:00 PM in AKST on the previous day. Midnight in JST is 6:00 AM in AKST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to AKST time conversion table
| JST (JST) | AKST (AKST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | previous day |
| 6:00 AM | 12:00 PM | previous day |
| 7:00 AM | 1:00 PM | previous day |
| 8:00 AM | 2:00 PM | previous day |
| 9:00 AM | 3:00 PM | previous day |
| 12:00 PM | 6:00 PM | previous day |
| 3:00 PM | 9:00 PM | previous day |
| 5:00 PM | 11:00 PM | previous day |
| 6:00 PM | 12:00 AM | same day |
| 9:00 PM | 3:00 AM | same day |
Why people convert JST to AKST time
- Scheduling a call from JST to AKST: a 10:00 AM start in JST lands at 4:00 PM in AKST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -18h gap: JST and AKST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AKST is 3:00 PM in JST.
- Booking travel or deliveries: tracking AKST local time against JST keeps pickup windows and arrival estimates honest across the -18h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -18h gap is not.
- With a -18h gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week AKST does.
About JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
About AKST (Alaska Standard Time)
Alaska Standard Time (AKST) is used in nearly all of Alaska. Due to Alaska's vast geographic size, the Aleutian Islands use Hawaii-Aleutian Standard Time instead. During summer months, Alaska switches to Alaska Daylight Time (AKDT, UTC-08:00).
Best time to call between JST and AKST
With a -18h offset there is no overlap inside a normal 9 AM – 5 PM day. AKST opens at 9:00 AM AKST, which is 3:00 PM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and AKST have no shared working hours because of the -18h gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 18 hours behind AKST (JST UTC+09:00 → AKST UTC-09:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
JST
Does not observe DST
AKST
☀ Currently in DST
Standard: UTC-09:00 · DST: UTC-08:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between JST and AKST?
JST (JST, UTC+09:00) is 18 hours behind AKST (AKST, UTC-09:00). The gap is currently -18h.
How do I convert JST time to AKST time?
Add -18h to JST local time. For example, 9:00 AM in JST is 3:00 PM in AKST (previous day).
What time is it in AKST right now?
AKST uses AKST at UTC-09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -18h offset from JST.
What is the best time to call AKST from JST?
There is no shared working-hours window because of the -18h gap. The closest option is 1:00 PM in JST, which is 7:00 PM in AKST.
Which is behind, JST or AKST?
JST is 18 hours behind AKST. When it is 12:00 PM in JST it is 6:00 PM in AKST.
Does daylight saving time affect the JST–AKST difference?
Neither zone observes daylight saving time, so the -18h offset between JST and AKST is fixed all year.
Which other cities share JST's time zone?
JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.
Which countries use JST, JST's zone?
JST is used in Japan.
Is there a day difference between JST and AKST?
Sometimes. The -18h gap is large enough that 8:00 PM or later in JST already falls on the in AKST.
What is the time difference between JST and AKST?
AKST is -18h from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is AKST in?
AKST operates on its local timezone.
Which countries use JST (Japan Standard Time)?
JST is used in Japan.
Does JST observe daylight saving time?
No, JST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about JST?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
Which cities are in the AKST timezone?
Major cities in the AKST timezone include Anchorage, Fairbanks, Juneau, Sitka, Wasilla.
What is the UTC offset for AKST?
Alaska Standard Time (AKST) is at UTC-09:00. During daylight saving time, it shifts to AKDT.
What should I know about the AKST timezone?
Alaska is the largest US state by area but has only about 730,000 residents. Anchorage is the most populous city in AKST with about 290,000 people.
When is it midnight in JST, what time is it in AKST?
When it is 12:00 AM (midnight) in JST (JST), it is -18h later in AKST (AKST).
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See every conversion from JST →·See every conversion from AKST →