AST to GMT time converter
Greenwich Mean Time (GMT) is 4 hours ahead of Atlantic Time (AST) in January and 3 hours ahead in July, because daylight saving time shifts the difference. Use the grid below to line up Halifax and Greenwich: 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 06:43 ADT in Halifax and 09:43 UTC in Greenwich.
2/10 zones · drag the tape, scroll sideways or use the arrow keys; Home jumps back to now.
AST to GMT: frequently asked
What is the time difference between AST and GMT?
Greenwich Mean Time (GMT) is 4 hours ahead of Atlantic Time (AST) in January and 3 hours ahead in July, because daylight saving time shifts the difference.
What time is 9 AM AST in GMT?
9:00 AM AST is 1:00 PM GMT in January, and 12:00 PM GMT in July.
When do working hours overlap between Halifax and Greenwich?
In January: Both sides are within 9:00 AM–5:00 PM working hours between 9:00 AM and 1:00 PM AST (1:00 PM to 5:00 PM GMT). In July: Both sides are within 9:00 AM–5:00 PM working hours between 9:00 AM and 2:00 PM AST (12:00 PM to 5:00 PM GMT).