combine two columns by date

[Perez63]

I created a form and want to ascend two columns by date order. Example 1st column has dates from Sept. 05 and Nov 05 and the second column has dates Aug. 05 and Oct 05. How do I get the form to merge these two columns so that the date order is Aug, Sept, Oct and November.

 

[Sammy B]

Just a quick question. Are these dates in 2 different tables?