December 7 is the 341st day of the year in common years and the 342nd in leap years. In the context of the modern calendar system it falls in early December and leaves 24 days remaining in a normal year. The date is recorded with its ordinal position in many calendars and almanacs — for example, it is often noted simply as the 341st day on lists of day numbers (341st day (342nd in leap years)), within the framework of the Gregorian calendar.

Overview and calendar details

As a fixed date, December 7 retains the same weekday pattern from year to year with regular cycles driven by leap years. In the Northern Hemisphere it falls toward the start of meteorological winter and is often part of seasonal festivals and year-end planning. The date's numeric placement means it commonly serves as a reference point for counting days until the end of the year.

Historical and cultural significance

December 7 is notable for several widely remembered events and observances. The most internationally recognized is the Japanese attack on the United States naval base at Pearl Harbor on December 7, 1941, an event that led directly to the U.S. entry into World War II. The date is observed in the United States as National Pearl Harbor Remembrance Day to honor those who died.

Another institutional observance linked to this date is International Civil Aviation Day, which commemorates the signing of the Convention on International Civil Aviation (the Chicago Convention) on December 7, 1944. Religious and local calendars also assign feast days and commemorations to this date, such as the traditional feast of Saint Ambrose in some Christian traditions.

Notable events and births

  • Major historical events: the attack on Pearl Harbor (1941); signing of the Chicago Convention on International Civil Aviation (1944).
  • Observances: National Pearl Harbor Remembrance Day (United States), International Civil Aviation Day (United Nations observance), and various local religious feast days.
  • Notable births on December 7 include several public figures across politics, science and the arts; such dates are often cited in biographical summaries and encyclopedias.

As with any calendar date, December 7 carries a different emphasis depending on regional history, cultural traditions and institutional remembrances. It is used both as a simple chronological marker and as a focal point for commemorative events that continue to shape public memory and international observances.