Auto Populate Field With Date When Other Field Is Selected From Validation List

In the following extract, I would like to have today's date placed into Col K when an entry is made into Col J.

Entry into Col J is from a validation list of 3 options. What I desire is that when one of these options is selected ("Complete"), then I would like today's date to be written into Col K.

Currently Col K has a validation list which comprises dates from 1st of each month from July to June.

I need a fixed date as text preferably, so was thinking the VBA function "Date" on a Change Workbook Sub.

The information is currently part of a Table in Excel 2007 that has about 500 records.

IdeasList

*
J
K

2
Status
Month Completed

3
In Progress
*

4
Complete
Jul-13

5
*
*

6
*
*

Data Validation in Spreadsheet

Cell
Allow
Datas
Input 1
Input 2

J4
List
*
=ValidationList_Status
*

K4
List
*
=ValidationList_Months
*