Skip to content

HST to JST Converter

JST is 19 hours ahead of HST

Current HST Time
--:--:-- --
Pacific/Honolulu
Current JST Time
--:--:-- --
Asia/Tokyo
Time Diff
19h ahead
HST
UTC-10
JST
UTC+9

HST to JST Conversion Table

Green rows indicate standard business hours (9 AM – 5 PM) in JST

HST to JST time conversion table showing all 24 hours
HST JST
12:00 AM 7:00 PM
1:00 AM 8:00 PM
2:00 AM 9:00 PM
3:00 AM 10:00 PM
4:00 AM 11:00 PM
5:00 AM 12:00 AM +1d
6:00 AM 1:00 AM +1d
7:00 AM 2:00 AM +1d
8:00 AM 3:00 AM +1d
9:00 AM 4:00 AM +1d
10:00 AM 5:00 AM +1d
11:00 AM 6:00 AM +1d
12:00 PM 7:00 AM +1d
1:00 PM 8:00 AM +1d
2:00 PM 9:00 AM +1d
3:00 PM 10:00 AM +1d
4:00 PM 11:00 AM +1d
5:00 PM 12:00 PM +1d
6:00 PM 1:00 PM +1d
7:00 PM 2:00 PM +1d
8:00 PM 3:00 PM +1d
9:00 PM 4:00 PM +1d
10:00 PM 5:00 PM +1d
11:00 PM 6:00 PM +1d

Converting Hawaii Standard Time to Japan Standard Time

Hawaii Standard Time (HST) and Japan Standard Time (JST) are separated by a 19 hours time difference. JST is 19 hours ahead of HST. HST is UTC-10, used in United States, while JST is UTC+9, used in Japan.

When converting from HST to JST, the key reference points to remember are: 9:00 AM HST equals 4:00 AM JST, 12:00 PM noon HST equals 7:00 AM JST, and 5:00 PM HST equals 12:00 PM JST. The conversion table above shows every hour of the day mapped between these two time zones.

Scheduling Across HST and JST

For professionals scheduling meetings between HST and JST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 19 hours difference, the window of overlap may be limited, making early morning or late evening calls necessary for one party. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.

Daylight Saving Time Considerations

HST does not observe Daylight Saving Time, maintaining UTC-10 year-round. JST does not observe DST, staying at UTC+9 year-round.

Frequently Asked Questions

What is the time difference between HST and JST?
Japan Standard Time (JST) is 19 hours ahead of Hawaii Standard Time (HST). When it is 12:00 PM noon in HST, it is 7:00 AM in JST.
How do I convert HST to JST?
To convert HST to JST, add 19 hours to the HST time. For example, 9:00 AM HST is 4:00 AM JST. Use the conversion table above for a quick reference of all 24 hours.
Does HST or JST observe Daylight Saving Time?
HST does not observe Daylight Saving Time. JST does not observe Daylight Saving Time. During DST transitions, the time difference between these zones may change by 1 hour.
What is the best time to schedule a call between HST and JST?
The best time to schedule a call between HST and JST is during overlapping business hours. If you are in HST, try scheduling between 9:00 AM and 5:00 PM your time, then check the conversion table above to see what that corresponds to in JST.
Is HST ahead or behind JST?
HST (UTC-10) is 19 hours behind JST (UTC+9). HST corresponds to the IANA time zone Pacific/Honolulu, while JST corresponds to Asia/Tokyo.

Related Conversions

Cities in These Time Zones

Time Zone Info