Overview
September 25 is the 268th day of the year in common years and the 269th day in leap years. By this date there are typically 97 days remaining in the year. It falls in the second half of September and, in the Northern Hemisphere, is usually considered part of early autumn following the autumnal equinox.
Calendar context
The numbering of days such as September 25 follows the Gregorian calendar, the civil calendar used internationally for most secular purposes. In leap years an extra day in February shifts the ordinal number for each subsequent date; see general information about leap years and the structure of the Gregorian calendar for background on how this adjustment is applied.
Notable events
Many dates accumulate historical incidents across centuries. Examples commonly associated with September 25 include medieval battles, political milestones, and cultural moments. A widely cited medieval event on this date is the Battle of Stamford Bridge in 1066, a key confrontation in English history. In the modern era, 1789 is known for a significant step in American constitutional history when the national legislature proposed amendments that later became the Bill of Rights.
Notable births
- William Faulkner (1897–1962), American novelist and Nobel laureate, born on this date.
- Mark Hamill (born 1951), American actor best known for his role in the Star Wars films.
- Will Smith (born 1968), American actor and musician, celebrates his birthday on September 25.
Observances and cultural notes
September 25 does not correspond to a single global holiday, but many countries and communities observe festivals, commemorations, or awareness days around this time. In religious calendars it can be a feast day for particular saints and in civic life it may host local anniversaries or cultural events. Because the date sits late in September, it often features activities tied to harvests, academic terms beginning, and seasonal transition themes.