September 14 is the 257th day of the year in the Gregorian calendar, with 108 days remaining until the end of the year. It is often associated with the transition from summer to autumn in the Northern Hemisphere, marked by changing leaves and cooler temperatures. Historically, September 14 has seen various significant events, including the founding of the city of San Francisco in 1776 and the celebration of National Cream-Filled Donut Day in the United States. It is also recognized as the day when the Holy Cross is commemorated in some Christian traditions.