Curaçao runs at UTC-4 permanently. Atlantic Standard Time, no daylight saving. IANA identifier: America/Curacao. The capital, Willemstad, has a historic harbor district (Handelskade) with distinctive colonial architecture in bright colors that has become the island’s visual signature.
Curaçao became a separate constituent country of the Kingdom of the Netherlands in 2010, when the Netherlands Antilles was dissolved. It shares its timezone (UTC-4) with Aruba, Bonaire, and the rest of the northeastern Caribbean.
The refinery island
Curaçao built one of the Western Hemisphere’s largest oil refineries in 1918, the Isla refinery, which processed Venezuelan crude oil for export to Europe and the Americas. At its peak, the refinery drove the island’s economy and its immigration patterns: workers came from across the Caribbean, from Venezuela, from the Netherlands, creating a society of extraordinary ethnic and linguistic diversity.
Papiamentu (spelled Papiamentu on Curaçao, Papiamento on Aruba), the local creole language, reflects this diversity: Portuguese-Spanish-Dutch-English-West African, a language that grew out of the intersection of enslaved Africans, Portuguese traders, Dutch colonizers, and Spanish-speaking Venezuelan neighbors.
The refinery has had significant environmental problems and repeated closures and management changes. Venezuela’s PDVSA leased and operated it from 1985 to 2019; subsequent operators have struggled with the facility’s aging infrastructure.
Willemstad and the oldest synagogue in the Americas
The Mikvé Israel-Emanuel synagogue in Willemstad, built in 1732, is the oldest continuously operating synagogue in the Americas. The Sephardic Jewish community of Curaçao, descendants of Jews who fled the Spanish Inquisition via Brazil, established the congregation in the mid-17th century. The synagogue floor is covered in white sand, a custom whose origins are debated: some say it represents the desert wandering, others that it muffled sound during the era of persecution.
The synagogue has been operating on roughly this schedule since 1732: Sabbath services from Friday sunset to Saturday night, measured by the actual position of the sun at 69°W longitude. UTC-4 is the civil time. Jewish religious time is lunar-solar: Sabbath begins when three stars appear in the sky. The exact time shifts by minutes each week.
