GMT to HST time converter
Hawaii Time (HST) is 10 hours behind Greenwich Mean Time (GMT) all year round. Use the grid below to line up Greenwich and Honolulu: drag the cursor across the day, and working hours (9 AM–5 PM) are highlighted in every row so you can spot a slot that suits both sides.
Right now it is 09:43 UTC in Greenwich and 23:43 HST in Honolulu.
Tue, Oct 20
UTC home
09:43
Tue, Oct 20 · UTC+0
Honolulu
23:43 -1
Mon, Oct 19 · UTC-10
2/10 zones · drag the tape, scroll sideways or use the arrow keys; Home jumps back to now.
GMT to HST: frequently asked
What is the time difference between GMT and HST?
Hawaii Time (HST) is 10 hours behind Greenwich Mean Time (GMT) all year round.
What time is 9 AM GMT in HST?
9:00 AM GMT is 11:00 PM HST the previous day.
When do working hours overlap between Greenwich and Honolulu?
Standard 9:00 AM–5:00 PM working hours never overlap. The closest fit is 7:00 PM GMT, which is 9:00 AM HST.