Check a date

[jaycee]

Good morning,

On my sheet "Enable" in cell "H10" is an end date, in cell "G10" is the start date, in cell "J10" is Months & in Cell "K10" is days, when a user selects more than 9 months (difference beween G10 & H10) I would like a pop up to state that it is more than 9 months.
J10 & K10 can both work together ie can add 3 months and 5 days.

Any help appreciated
Excel 2010

 

[jaycee]

Just found the DATEDIF function (although not on the functions list in 2010) this does the months etc. I have added this to cell "L10"
Problem now is that this may occur on any row from L10 to L500 any idea how to get the popup to work for this, and let users know which cell it equates to?