AKST to JST Time Converter
JST is 17 hours ahead of AKST. Alaska is currently on AKDT (UTC-8:00), and JST is UTC+9:00.
Best Time to Call Between AKST and JST
Both zones are inside normal business hours between 4:00 PM and 5:00 PM AKST — that's 9:00 AM to 10:00 AM JST. That's a 1-hour window.
both at work AKST only JST only neither — hours along the strip are AKST.
Common Times Converted
AKST on the left, JST on the right.
AKST to JST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| AKST | JST | Working hours |
|---|---|---|
| 12:00 AM | 5:00 PM | — |
| 1:00 AM | 6:00 PM | — |
| 2:00 AM | 7:00 PM | — |
| 3:00 AM | 8:00 PM | — |
| 4:00 AM | 9:00 PM | — |
| 5:00 AM | 10:00 PM | — |
| 6:00 AM | 11:00 PM | — |
| 7:00 AM | 12:00 AM next day | — |
| 8:00 AM | 1:00 AM next day | — |
| 9:00 AM | 2:00 AM next day | AKST only |
| 10:00 AM | 3:00 AM next day | AKST only |
| 11:00 AM | 4:00 AM next day | AKST only |
| 12:00 PM | 5:00 AM next day | AKST only |
| 1:00 PM | 6:00 AM next day | AKST only |
| 2:00 PM | 7:00 AM next day | AKST only |
| 3:00 PM | 8:00 AM next day | AKST only |
| 4:00 PM | 9:00 AM next day | Both zones |
| 5:00 PM | 10:00 AM next day | JST only |
| 6:00 PM | 11:00 AM next day | JST only |
| 7:00 PM | 12:00 PM next day | JST only |
| 8:00 PM | 1:00 PM next day | JST only |
| 9:00 PM | 2:00 PM next day | JST only |
| 10:00 PM | 3:00 PM next day | JST only |
| 11:00 PM | 4:00 PM next day | JST only |
What AKST and JST Actually Are
AKST — Alaska Standard Time
Anchorage, Fairbanks, Juneau. Standing at UTC-9:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to AKST.
Alaska compressed four time zones into one in 1983, moving most of the state onto a single clock to keep business hours aligned with the rest of the country.
JST — Japan Standard Time
Tokyo, Osaka, Yokohama, Nagoya, Sapporo. Standing at UTC+9:00 as written, and the region does not change its clocks, so that offset holds all year. Japan does not observe daylight saving, so this offset is fixed year-round.
Japan abolished daylight saving in 1952 and has resisted every attempt to reintroduce it, including a proposal around the 2020 Olympics.
What This Means in Practice
The date changes mid-working-day
For 8 of the eight hours in a normal AKST working day, the equivalent JST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
This gap is not fixed
AKST changes its clocks and JST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Nearly opposite sides of the clock
At 17 hours apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on AKST
Cities on JST
Frequently Asked Questions
What is the time difference between AKST and JST?
JST is 17 hours ahead of AKST. That is the live figure. Taken strictly as written, the gap between AKST and JST is 18 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM AKST in JST?
9:00 AM AKST is 2:00 AM the next day JST.
What are the best hours to schedule a call between AKST and JST?
Between 4:00 PM and 5:00 PM AKST, which is 9:00 AM to 10:00 AM JST. Both sides are inside normal business hours through that window.
Does the difference between AKST and JST change during the year?
Yes. AKST observes daylight saving and JST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does JST always mean Japan Standard Time?
Japan does not observe daylight saving, so this offset is fixed year-round.