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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.
Use the Day() formula to add to the days. Enter the new formula in a cell adjacent to the A1 cell. The following code adds 10 days to the date in the A1 cell: =date(year(a1), month(a1), day(a1) + 10). The equal sign indicates a formula is entered, and it is required by Excel.