Current Time in Canada/Atlantic Time Zone

Overview and Geography

The Canada/Atlantic zone covers the four Atlantic provinces of Canada: Nova Scotia, New Brunswick, Prince Edward Island, and the majority of Labrador (the mainland portion of Newfoundland and Labrador). It does not include the island of Newfoundland, which uses the unique Newfoundland Time Zone (UTC-03:30 standard, UTC-02:30 daylight). The zone also excludes the southeastern tip of Labrador (the region around L'Anse-au-Clair) which follows Newfoundland Time. The major cities in this zone include Halifax (Nova Scotia), Saint John (New Brunswick), Charlottetown (Prince Edward Island), and Happy Valley-Goose Bay (Labrador).

Offset and Abbreviations

During standard time, the offset is UTC-04:00, known as Atlantic Standard Time (AST). During daylight saving time, clocks are advanced by one hour to UTC-03:00, known as Atlantic Daylight Time (ADT). The abbreviation AST is used in winter (typically from early November to early March), and ADT is used in summer (from early March to early November).

Daylight Saving Time Behavior

Canada/Atlantic observes daylight saving time (DST) in accordance with most of Canada and the United States. DST begins on the second Sunday of March at 2:00 AM AST, when clocks spring forward to 3:00 AM ADT. It ends on the first Sunday of November at 2:00 AM ADT, when clocks fall back to 1:00 AM AST. Recent and upcoming DST change dates: March 9, 2025 (forward); November 2, 2025 (back); March 8, 2026 (forward); November 1, 2026 (back). This pattern repeats yearly.

Comparison with Other Zones at UTC-04:00

Several other IANA zones share the same standard offset of UTC-04:00, but they differ in DST observance. For example, America/Anguilla, America/Antigua, America/Aruba, America/Barbados, America/Curacao, and America/Dominica do not observe DST and remain at UTC-04:00 year-round. America/Blanc-Sablon (in Quebec) also does not observe DST. America/Boa_Vista (Brazil) and America/Caracas (Venezuela) use UTC-04:00 without DST, though Venezuela has used various offsets historically. America/Campo_Grande and America/Cuiaba (Brazil) observe DST but on a different schedule (usually starting in October and ending in February). America/Glace_Bay (Nova Scotia) is a duplicate of Canada/Atlantic. Thus, during summer, Canada/Atlantic is one hour ahead of non-DST UTC-04:00 zones; during winter, it matches them.

Business Hours and Scheduling Calls

When scheduling calls with Canada/Atlantic, note that the zone is UTC-04:00 in winter and UTC-03:00 in summer. For example, during winter (AST), noon in Halifax is 12:00 PM AST, which is 16:00 UTC and 11:00 AM Eastern Standard Time (EST, UTC-05:00). During summer (ADT), noon in Halifax is 15:00 UTC and 12:00 PM Eastern Daylight Time (EDT, UTC-04:00). For calls with Europe (e.g., London at UTC+00:00 in winter, UTC+01:00 in summer), the time difference is 4 hours in winter (London ahead) and 4 hours in summer (London ahead). For calls with Asia (e.g., Tokyo at UTC+09:00), the difference is 13 hours in winter (Tokyo ahead) and 12 hours in summer. Best overlap for business with North America is typically 9:00 AM to 5:00 PM local time, which aligns with 8:00 AM to 4:00 PM Eastern Time in winter and 9:00 AM to 5:00 PM Eastern Time in summer.

Key Cities and Regions

• Halifax, Nova Scotia: The largest city in the zone, major port and economic hub.
• Saint John, New Brunswick: Largest city in New Brunswick, industrial center.
• Charlottetown, Prince Edward Island: Capital and largest city of PEI.
• Happy Valley-Goose Bay, Labrador: Major service center in Labrador.
• Sydney, Nova Scotia: Urban center on Cape Breton Island.
• Fredericton, New Brunswick: Provincial capital.