Alrighty, I think I may have got it, sorry originally I was reading your request wrong.
Attached you will find your original workbook update to include a command button that runs a code I believe accomplishes what you are trying to do
To insert the code into your workbook:
1.Press Alt+F8 on your keyboard
2.Clear the macro name box and type AddDifference in the blank box provided
3.Select the Create option
4.In between the Sub AddDifference() and End Sub copy and paste the below code:
5.Anything that appears in green is a comment I left to help you understand. Exit out of the Visual Basic Window.
6. On the main excel menu select the Developer tab and then select Insert. Select Command Button option and place it on you workbook. Select the InsertDate macro in the Assign Macro pop up window. and then select okay
7.Select the command button to run the code
Let me know if this is what you were looking for or if you have any questions.
Thanks1
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