Since when does the year start on January 1st?
Since the 16th century, shortly before the adoption of the Gregorian calendar on Friday, October 15, 1582. It was the day after Thursday, October 4, 1582. Explanations.
Since the 16th century, shortly before the adoption of the Gregorian calendar on Friday, October 15, 1582. It was the day after Thursday, October 4, 1582. Explanations.