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The Microsoft Excel DAY function returns the day of the month (a number from 1 to 31) given a date value. The DAY function is a built-in function in Excel that is categorized as a Date/Time Function. It can be used as a worksheet function (WS) and a VBA function (VBA) in Excel. As a worksheet function, the DAY function can be entered as part of a formula in a cell of a worksheet. As a VBA function, you can use this function in macro code that is entered through the Microsoft Visual Basic Editor.
Windows versions of Excel store the date as a number representing the number of full days since midnight January 1, 1900 plus the number of hours, minutes, and seconds for the current day. This number is called a serial number or serial date.