JST to HST Converter
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Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
9:00 pm21:00 JST (UTC+9), Oct 18, 2026 = 2:00 am02:00 HST (UTC-10), Oct 18, 2026
JST is 19 hours ahead of HST.
JST and HST examples
These examples always use JST (UTC+9) and HST (UTC-10). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
JST is 19 hours ahead of HST.
How the time difference changes
JST is 19 hours ahead of HST year-round.
Working hours of 9:00 am to 6:00 pm in JST correspond to 2:00 pm (previous day) to 11:00 pm (previous day) in HST.Working hours of 09:00 to 18:00 in JST correspond to 14:00 (previous day) to 23:00 (previous day) in HST.
Compare JST time with HST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Japan Standard Time is 19 hours ahead of Hawaii Standard Time.
9:00 pm21:00 in JST is 2:00 am02:00 in HST
JST to HST call time
Best time for a conference call or a meeting is between 9am-1pm09:00-13:00 in JST which corresponds to 2pm-6pm14:00-18:00 in HST (previous day)
9:00 pm21:00 Japan Standard Time (JST). Offset UTC +9:00 hours
2:00 am02:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours
9:00 pm21:00 JST / 2:00 am02:00 HST
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Japan Standard Time
Offset: JST is 9 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Japan
Principal Cities: The largest city in the JST time zone is Tokyo in Japan, with about 9.733 million people. Other major cities in this time zone include Yokohama, Osaka, Nagoya, Sapporo.
Daylight Saving: Clocks in Japan Standard Time (JST) do not change for daylight saving time, so JST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
Current time in Japan: Japan time now
JST representations, usage and related time zones
- +09 - basic short
- +0900 - basic
- +09:00 - extended
- +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
- India - Military abbreviation for JST
- I - short form of 'India'
- Asia/Tokyo
- Japan
- AWDT - Australian Western Daylight Time
- CHOST - Choibalsan Summer Time
- I - India Time Zone
- IRKST - Irkutsk Summer Time
- JST - Japan Standard Time
- KST - Korea Standard Time
- PWT - Palau Time
- TLT - East Timor Time
- ULAST - Ulaanbaatar Summer Time
- WIT - Eastern Indonesian Time
- YAKT - Yakutsk Time
Hawaii Standard Time
Offset: HST is 10 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Principal Cities: The largest city in the HST time zone is Honolulu in the United States, with about 350,964 people. Other major cities in this time zone include Pearl City, Hilo, Kailua, Waipahu.
Daylight Saving: Some places on Hawaii Standard Time (HST) keep the same time all year, while others use HST for only part of the year and change their clocks for daylight saving time; see upcoming clock changes worldwide.
Today the lighter areas are on UTC−9 (HDT).
HST representations, usage and related time zones
- -10 - basic short
- -1000 - basic
- -10:00 - extended
- -1000 - sign character (-) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates an offset of ten hours to the west of the zero meridian.
- Whiskey - Military abbreviation for HST
- W - short form of 'Whiskey'
- America/Adak
- America/Atka
- HST
- Pacific/Honolulu
- Pacific/Johnston
- US/Aleutian
- US/Hawaii
- HAST - Hawaii-Aleutian Standard Time
- CKT - Cook Island Time
- HST - Hawaii Standard Time
- TAHT - Tahiti Time
- W - Whiskey Time Zone