Column sorts oddly, and not in chronological/reverse-chronological order

Ranji

Allan
I am using date plugins for column..Column sorts oddly, and not in chronological/reverse-chronological order...

My inputs are
Wed Aug 01,2012
Tue Jul 31,2012
Tue Jul 01,2012
Thu Aug 09,2012
Thu Aug 16,2012

After Sorting
Wed Aug 01,2012
Tue Jul 31,2012
Tue Jul 01,2012
Thu Aug 16,2012
Thu Aug 09,2012

How can i rectify the problem?

Ranji

allan