Compare 2 string columns YYYY-Weekno in ssis

Hi all,

I have a 2 string columns in Table contains YYYY-Weekno . I want to compere these 2 columns. How is possible.?

I have to pass values in Conditional split transformation Date1 > date2 then update below tasks like way..

Example :     Date1                     Date2 

                   2018-35                 2017-44

                  2019-45                 2019-11

I want to compare these 2 column in ssis expressions which is latest … or is there any possible to convert it in to date in throw expression and compare ?  

Thanks,

Sriraj