Nova Scotia is in the Atlantic Time Zone in Canada, which is 4 hours behind Greenwich Mean Time (GMT-4).
Like most provinces in Canada, Daylight Saving Time is observed in Nova Scotia, where the time is shifted forward by 1 hour, resulting in a 3 hours difference behind Greenwich Mean Time (GMT-3).
After the Summer months the time is shifted back by 1 hour resulting in the normal 4 hours difference behind GMT.