Changing an Integer to an Excel Serial Number

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Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. CAUTION: This macro will overwrite the original date with the new date.

To run the macro, follow these steps:

1. Type the following code into a module sheet:

         Sub ConvertInteger()
   
             ' Extract the first two digits.
             yr = Fix(ActiveCell * 0.0001)
   
             ' Extract the second two digits.
             mo = Right(Fix((ActiveCell - (yr * 10000)) * 0.01), 2)
   
             ' Extract the last two digits.
             dy = ActiveCell - (Fix(ActiveCell * 0.01) * 100)
   
             ' Return the result to the original cell in Microsoft Excel date
             ' format.
             ActiveCell.Value = DateSerial(yr, mo, dy)
   
         End Sub
   						

2. Click a cell in a worksheet that has a date that needs to be converted, and click Macro on the Tools menu. (In Microsoft Excel 97 and Microsoft Excel 98, click the Tools menu, point to Macro, and then click Macros.)
3. Select the name "ConvertInteger," and click Run.

If the active cell contained the number 970604 the ConvertInteger subroutine will convert the cell contents to 6/4/97. Microsoft Excel will recognize the new contents of the cell as a date, so you can perform date calculations on the cell.