September 24 is the 267th day of the year in the Gregorian calendar, with 98 days remaining until the end of the year. It is often associated with the arrival of autumn in the Northern Hemisphere, where temperatures begin to cool and leaves change color. Several notable events have occurred on this date throughout history. For example, in 1960, the first episode of the popular television show The Flintstones aired. Additionally, September 24 is recognized as National Punctuation Day in the United States, celebrating the importance of punctuation in writing.