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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.
In this formula, the Excel WEEKDAY function gets the day of week as a serial number. And the CHOOSE function uses that number as index_num (the 1st argument) that indicates which value from the list of value arguments to return.