January 1 is the first day of the year in the Gregorian calendar The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was named, on 24 February 1582 by the papal bull Inter gravissimas. It was adopted later that year by a handful of countries, with other countries adopting. There are 364 days remaining until the end of the year (365 in leap years A leap year is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronized with the astronomical or seasonal year). The preceding day is December 31 December 31 is the 365th day of the year in the Gregorian calendar. It is the last day of the Gregorian year. The day following is January 1 of the next year of the previous year.
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