GMT to AST time converter
Atlantic Time (AST) is 4 hours behind Greenwich Mean Time (GMT) in January and 3 hours behind in July, because daylight saving time shifts the difference. Use the grid below to line up Greenwich and Halifax: 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 06:43 ADT in Halifax.
2/10 zones · drag the tape, scroll sideways or use the arrow keys; Home jumps back to now.
GMT to AST: frequently asked
What is the time difference between GMT and AST?
Atlantic Time (AST) is 4 hours behind Greenwich Mean Time (GMT) in January and 3 hours behind in July, because daylight saving time shifts the difference.
What time is 9 AM GMT in AST?
9:00 AM GMT is 5:00 AM AST in January, and 6:00 AM AST in July.
When do working hours overlap between Greenwich and Halifax?
In January: Both sides are within 9:00 AM–5:00 PM working hours between 1:00 PM and 5:00 PM GMT (9:00 AM to 1:00 PM AST). In July: Both sides are within 9:00 AM–5:00 PM working hours between 12:00 PM and 5:00 PM GMT (9:00 AM to 2:00 PM AST).