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September 21
Sign in to saveAlso known as September 21st, 21st of September, 21 September, Sep 21
day of the year
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September 21 is the 265th day of the year in the Gregorian calendar, marking the approximate beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere. It matters because it's often associated with the autumnal and vernal equinoxes, when day and night are nearly equal length across the globe.
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September 21 is the 264th day of the year (265th in leap years) in the Gregorian calendar; 101 days remain until the end of the year.
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