Convert JST to HST — Time Difference Between Japan Standard Time and Adak

How to Convert JST to HST

Drag the slider on the JST timeline to pick your time — the HST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.

What Is the Time Difference Between JST and HST?

Adak (HST) is 19 hours behind Japan Standard Time (JST). To convert, subtract 19 hours — for example, 9:00 AM JST is 2:00 PM (previous day) HST.

JST to HST Quick Reference

JST to HST Meeting Planner

Use the color-coded table above to find overlapping work hours between Tokyo and Adak. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.

Why Trust This JST to HST Converter?

Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.