Current Time in America/Thule Time Zone

Where America/Thule Applies

The America/Thule zone covers the northwestern corner of Greenland, including the Pituffik Space Base (formerly Thule Air Base) and the nearby town of Qaanaaq. This is the only part of Greenland that uses this time zone; the rest of Greenland uses America/Nuuk (UTC-03:00 standard, UTC-02:00 daylight) or America/Scoresbysund (UTC-01:00 standard, UTC+00:00 daylight). The zone is named after the historical Thule region, which is now part of the Avannaata municipality.

Offset and Abbreviation

During standard time, America/Thule is at UTC-04:00, which is designated as Atlantic Standard Time (AST). When daylight saving time is in effect, the offset shifts to UTC-03:00, known as Atlantic Daylight Time (ADT). These abbreviations are shared with other Atlantic time zones in the Caribbean and eastern Canada, but the specific observance pattern is unique to this region.

Daylight Saving Time in America/Thule

America/Thule observes daylight saving time (DST) in line with the United States schedule, due to the presence of the Pituffik Space Base which operates under U.S. timekeeping rules. DST begins on the second Sunday of March, when clocks spring forward from 02:00 AST to 03:00 ADT. It ends on the first Sunday of November, when clocks fall back from 02:00 ADT to 01:00 AST. The upcoming transitions are:

• 2025-03-09: forward to ADT
• 2025-11-02: back to AST
• 2026-03-08: forward to ADT
• 2026-11-01: back to AST

This pattern means that during the northern summer, America/Thule is 3 hours behind Coordinated Universal Time (UTC-03:00), and during winter it is 4 hours behind (UTC-04:00). The DST period lasts about 8 months, from mid-March to early November.

Countries and Cities

The only country using America/Thule is Greenland, which is an autonomous territory within the Kingdom of Denmark. The primary settlements in this zone are Pituffik (the space base) and Qaanaaq, the administrative center of the region. Qaanaaq has a population of around 650 people, making it one of the northernmost towns in the world.

Business Hours and Scheduling

America/Thule is 4 hours behind Coordinated Universal Time (UTC-04:00) during standard time and 3 hours behind (UTC-03:00) during daylight time. This offset is the same as eastern parts of Canada (e.g., Halifax) and the Caribbean (e.g., Barbados) during standard time, but during DST it matches the eastern United States (e.g., New York) and much of eastern Canada. For business calls with North America, the overlap is good: when it is 09:00 in Thule, it is 08:00 in New York (during DST) or 07:00 in New York (during standard time). For Europe, the time difference is 4 to 5 hours: when it is 12:00 in Thule, it is 16:00 or 17:00 in London, and 17:00 or 18:00 in Central Europe. The best times for calls between Thule and Europe are typically in the late morning or early afternoon Thule time.