HST to JST Converter

Updating current time…
HST
Hawaii Standard Time
UTC−10
12am
3am
6am
9am
12pm
3pm
6pm
9pm
JST
Japan Standard Time
UTC+9
19h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

2:00 am02:00 HST (UTC-10), Oct 18, 2026 = 9:00 pm21:00 JST (UTC+9), Oct 18, 2026

HST is 19 hours behind JST.

HST and JST examples

These examples always use HST (UTC-10) and JST (UTC+9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

HST is 19 hours behind JST.

How the time difference changes

HST is 19 hours behind JST year-round.

Working hours of 9:00 am to 6:00 pm in HST correspond to 4:00 am (next day) to 1:00 pm (next day) in JST.Working hours of 09:00 to 18:00 in HST correspond to 04:00 (next day) to 13:00 (next day) in JST.

Compare HST time with JST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Hawaii Standard Time is 19 hours behind Japan Standard Time.
2:00 am02:00 in HST is 9:00 pm21:00 in JST

HST to JST call time
Best time for a conference call or a meeting is between 2pm-6pm14:00-18:00 in HST which corresponds to 9am-1pm09:00-13:00 in JST (next day)

2:00 am02:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours
9:00 pm21:00 Japan Standard Time (JST). Offset UTC +9:00 hours

2:00 am02:00 HST / 9:00 pm21:00 JST

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
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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.

Map of the areas on Hawaii Standard Time (HST)
HST all year HST part of the year

Today the lighter areas are on UTC−9 (HDT).

Open the world time zone map© OpenStreetMap

HST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -10 - basic short
  • -1000 - basic
  • -10:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -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.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Whiskey - Military abbreviation for HST
  • W - short form of 'Whiskey'
IANA/Olson: Reflects HST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Adak
  • America/Atka
  • HST
  • Pacific/Honolulu
  • Pacific/Johnston
  • US/Aleutian
  • US/Hawaii
Time zones with the GMT -10 offset:
  • HAST - Hawaii-Aleutian Standard Time
  • CKT - Cook Island Time
  • HST - Hawaii Standard Time
  • TAHT - Tahiti Time
  • W - Whiskey Time Zone

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

Map of the areas on Japan Standard Time (JST)
JST all year

Open the world time zone map© OpenStreetMap

JST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +09 - basic short
  • +0900 - basic
  • +09:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +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.
Military/NATO: Used by the U.S. military, Chinese military and others
  • India - Military abbreviation for JST
  • I - short form of 'India'
IANA/Olson: Reflects JST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Tokyo
  • Japan
Time zones with the GMT +9 offset:
  • 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
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT