Convert JST to AST — Time Difference Between Japan Standard Time and St Thomas

How to Convert JST to AST

Drag the slider on the JST timeline to pick your time — the AST 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 AST?

St Thomas (AST) is 13 hours behind Japan Standard Time (JST). To convert, subtract 13 hours — for example, 9:00 AM JST is 8:00 PM (previous day) AST.

JST to AST Quick Reference

JST to AST Meeting Planner

Use the color-coded table above to find overlapping work hours between Tokyo and St Thomas. 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 AST 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.