TimeToZone

HST to JST Converter

JST is 19 hours ahead of HST. 9:00 AM HST = 4:00 AM JST (next day).

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HSTfrom
Hawaii-Aleutian Standard Time
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JST
Japan Standard Time
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JST is 19 hours ahead of HST. To convert HST to JST, add 19 hours to the HST time: 9:00 AM HST = 4:00 AM JST (next day).

HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). JST (Japan Time) is used in Japan.

HST to JST time conversion table

HST to JST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

12 AM – 7 AM HST
HSTJST
12:00 AM7:00 PM
1:00 AM8:00 PM
2:00 AM9:00 PM
3:00 AM10:00 PM
4:00 AM11:00 PM
5:00 AM12:00 AM+1
6:00 AM1:00 AM+1
7:00 AM2:00 AM+1
8 AM – 3 PM HST
HSTJST
8:00 AM3:00 AM+1
9:00 AM4:00 AM+1
10:00 AM5:00 AM+1
11:00 AM6:00 AM+1
12:00 PM7:00 AM+1
1:00 PM8:00 AM+1
2:00 PM9:00 AM+1
3:00 PM10:00 AM+1
4 PM – 11 PM HST
HSTJST
4:00 PM11:00 AM+1
5:00 PM12:00 PM+1
6:00 PM1:00 PM+1
7:00 PM2:00 PM+1
8:00 PM3:00 PM+1
9:00 PM4:00 PM+1
10:00 PM5:00 PM+1
11:00 PM6:00 PM+1

Conversion table from HST to JST for 7 Nov 2026. A tick marks hours that fall between 9 AM and 5 PM in both places. +1 means the next day in JST, −1 the previous day.

  • ✓ marks 9 AM–5 PM in both places
  • Greyed times are night in the destination (10 PM–6 AM)

How to convert HST to JST

Add 19 hours to the HST time to get JST.

Example: 9:00 AM HST = 4:00 AM JST (next day).

Across midnight: 10:00 PM HST = 5:00 PM JST (next day). The date changes, so always check the day as well as the hour.

Time difference between HST and JST

The time difference between HST and JST is 19 hours all year – JST is ahead of HST.

HST and JST during daylight saving time

  • HST does not observe daylight saving time; it stays on UTC−10 all year.
  • JST does not observe daylight saving time; it stays on UTC+9 all year.

Best time for a meeting between HST and JST

HST and JST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 12:00 PM HST, which is 7:00 AM JST.

Plan a meeting across more time zones.

HST to JST FAQ

What is the time difference between HST and JST?

JST is 19 hours ahead of HST all year. 9:00 AM HST = 4:00 AM JST (next day).

What is 9 AM HST in JST?

9:00 AM HST is 4:00 AM JST (next day).

What is 12 PM (noon) HST in JST?

12:00 PM HST is 7:00 AM JST (next day).

Is JST ahead of or behind HST?

JST is 19 hours ahead of HST, so it is later in JST than in HST.

Does HST change for daylight saving time?

No. HST stays on the same offset all year, so conversions never shift for daylight saving time.

Does JST change for daylight saving time?

No. JST stays on the same offset all year, so conversions never shift for daylight saving time.

What is the best time for a meeting between HST and JST?

HST and JST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 12:00 PM HST, which is 7:00 AM JST.

Related conversions

Convert JST to HST

JST to HST

Convert HST to other time zones

HST to PSTHST to AESTHST to AKSTHST to ASTHST to AWSTHST to Bangladesh TimeHST to BRTHST to BSTHST to Philippine Time (PHT)HST to PKTHST to SASTHST to SGT

Convert other time zones to JST

IST to JSTEST to JSTAbbotsford Time to JSTAbidjan Time to JSTAbu Dhabi Time to JSTAdelaide Time to JSTAEST to JSTAgra Time to JSTAtlanta Time to JSTAugsburg Time to JSTAustralia Time to JSTAWST to JST

Learn more

HST time zoneJST time zone

Updated 7 November 2026. Time zone data: IANA tz database.