The first day of the Gregorian calendar year — globally observed.
New Year's Day on January 1 marks the start of the Gregorian calendar year. While the date is secular, it has been a public holiday in most countries since the Gregorian calendar was widely adopted in the 16th-17th centuries. In some Christian traditions it is also the Feast of the Circumcision of Christ or the Solemnity of Mary, Mother of God.
Computed for San Juan del Parana (America/Asuncion) using local sunrise, sunset and astronomical positions.