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

How to Convert AST to JST

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

Japan Standard Time (JST) is 13 hours ahead of St Thomas (AST). To convert, add 13 hours — for example, 9:00 AM AST is 10:00 PM JST.

AST to JST Quick Reference

AST to JST Meeting Planner

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