What is JST in AKST?

Alaska Time is 18 hours behind

Japan Standard Time is on UTC+9:00 and Alaska Time is on UTC−9:00 right now. The gap changes during the year — see below.

Convert a time

JST — Japan Standard Time

AKST — Alaska Time

11:00 pm

AKST, Fri, the previous day

Time in Tokyo: 5:30:23 PM
Time in Anchorage: 11:30:23 PM
Difference: −18 h
Next clock change: March 14, 2027

When the difference changes

Japan Standard Time and Alaska Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

Now – March 14, 2027Alaska Time is 18 hours behind
March 14, 2027 – November 7, 2027Alaska Time is 17 hours behind
November 7, 2027 – onwardsAlaska Time is 18 hours behind

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

Japan Standard Time

No clock changes

Japan Standard Time stays on JST all year, so its offset from UTC never moves.

Alaska Time

Sunday, March 14, 2027

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on AKDT after that.

JST to AKST conversion table

Every hour of Saturday, November 7, 2026, converted from Japan Standard Time to Alaska Time. 18 of the 24 hours fall on a different calendar day in Anchorage, which is marked.

12:00 am JST: 6:00 am AKST−1 day
1:00 am JST: 7:00 am AKST−1 day
2:00 am JST: 8:00 am AKST−1 day
3:00 am JST: 9:00 am AKST−1 day
4:00 am JST: 10:00 am AKST−1 day
5:00 am JST: 11:00 am AKST−1 day
6:00 am JST: 12:00 pm AKST−1 day
7:00 am JST: 1:00 pm AKST−1 day
8:00 am JST: 2:00 pm AKST−1 day
9:00 am JST: 3:00 pm AKST−1 day
10:00 am JST: 4:00 pm AKST−1 day
11:00 am JST: 5:00 pm AKST−1 day

12:00 pm JST: 6:00 pm AKST−1 day
1:00 pm JST: 7:00 pm AKST−1 day
2:00 pm JST: 8:00 pm AKST−1 day
3:00 pm JST: 9:00 pm AKST−1 day
4:00 pm JST: 10:00 pm AKST−1 day
5:00 pm JST: 11:00 pm AKST−1 day
6:00 pm JST: 12:00 am AKST
7:00 pm JST: 1:00 am AKST
8:00 pm JST: 2:00 am AKST
9:00 pm JST: 3:00 am AKST
10:00 pm JST: 4:00 am AKST
11:00 pm JST: 5:00 am AKST

Scheduling between the two

Working hours overlap from 9:00 am to 12:00 pm JST, which is 3:00 pm to 6:00 pm AKST. Anything inside that window falls in the normal working day at both ends.