Current Time in America/Argentina/Ushuaia Time Zone

Overview and Coverage

America/Argentina/Ushuaia applies to the province of Tierra del Fuego, Antarctica, and South Atlantic Islands, including the city of Ushuaia, Rio Grande, and Tolhuin. It is one of the 13 IANA zones for Argentina, all of which use the same standard offset of UTC-03:00. The zone's abbreviation is ART (Argentina Time), which is used year-round as no daylight saving adjustments are made.

Offset and Daylight Saving Behavior

The offset is constant at UTC-03:00 throughout the year. Argentina has experimented with daylight saving time in the past, but since 2009, the country has remained on standard time permanently. The last DST transition in this zone occurred on March 15, 2009, when clocks were set back one hour. Since then, no further changes have been observed. This means that the time in Ushuaia does not shift relative to UTC, providing a stable schedule for residents and businesses.

Countries and Cities

Only Argentina uses this zone. Key cities include:

• Ushuaia – the capital of Tierra del Fuego and the southernmost city in the world.
• Rio Grande – a major industrial city in the province.
• Tolhuin – a smaller town known for its lakes and forests.

Business Hours and Scheduling

Because Ushuaia does not observe DST, its time relative to other zones is constant. For example, during Northern Hemisphere summer, when many North American and European zones shift to DST, the difference between Ushuaia and New York (UTC-04:00 EDT) is one hour (Ushuaia is one hour ahead). In winter, when New York is on EST (UTC-05:00), the difference is two hours. For London, during British Summer Time (UTC+01:00), Ushuaia is four hours behind; during GMT (UTC+00:00), it is three hours behind. Typical business hours in Ushuaia (9:00 AM to 6:00 PM ART) overlap well with morning hours in the Americas and late afternoon in Europe. For calls with East Asia, such as Tokyo (UTC+09:00), the overlap is limited; a 9:00 AM start in Ushuaia corresponds to 9:00 PM in Tokyo, so early morning or late evening calls may be necessary.

Comparison with Other Argentine Zones

All Argentine zones share the same offset and DST behavior, so there is no time difference between Ushuaia and Buenos Aires, Cordoba, or Mendoza. However, the IANA maintains separate identifiers for historical reasons, such as past differences in DST observance or local timekeeping. For practical purposes, any Argentine zone can be used interchangeably for scheduling within the country.