From
AST / ADT
Time Converter
AST to GMT Time Converter
Convert Atlantic Time to GMT with a live clock and clean permalinks.
To
GMT / BST
When it is 7:30 AM in Atlantic Time, it is 10:30 AM in GMT.
AST to GMT at a glance
GMT is 3 hours ahead of Atlantic Time. If someone gives you a time in Atlantic Time, move the clock by 3 hours to read it in GMT. A 9:00 AM start in Halifax becomes 12:00 PM in London.
What Atlantic Time covers
Atlantic Time is used in eastern Canada and parts of the Caribbean. Halifax is a common city reference for it. It matters when scheduling across North America and island markets farther east.
What GMT covers
GMT is commonly used as the United Kingdom time reference. In summer, the UK moves to British Summer Time. It is a familiar baseline for Europe, Africa, and global remote teams.
Quick answers
What is the time difference between AST and GMT?
GMT is 3 hours ahead of Atlantic Time.
What happens to a 3:00 PM meeting in AST?
It lands at 6:00 PM in GMT.
Does daylight saving time matter for AST to GMT?
Atlantic Time and GMT are shown using the offsets that are active right now, so the result already reflects any daylight saving change in effect today.