Convert GMT to AST — Time Difference Between Guernsey and St Thomas

How to Convert GMT to AST

Drag the slider on the GMT 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 GMT and AST?

St Thomas (AST) is 4 hours behind Guernsey (GMT). To convert, subtract 4 hours — for example, 9:00 AM GMT is 5:00 AM AST.

GMT to AST Quick Reference

GMT to AST Meeting Planner

Use the color-coded table above to find overlapping work hours between Guernsey 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 GMT 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.