Text To Date

Hi,
Requesting to help me out with the date issue as below:
I have dates in following form:
020513 which appears in excel as 20513
100513 which appears in excel as 100513
Now when i try to convert this general number into date using text to columns it returns result in this format:
020513 <text to columns> <result> 20-05-13, but infact it should have been 02-05-13.
100513 BUT THIS VALUE RETURNS CORRECT DATE ie 10-05-13
I understand that in first value excel does not counts 02 but it counts 20 from 05 and returns the value as 20
So is there any solution to this
Please reply... very needy