show data only which DB dates are greater than Todays date

Question

Our db Table is

 

PolicyNo	PolStartDate	PolicyEndDate
567	10-08-2017	10-08-2017
9087	10-08-2017	10-08-2017
9087	10-08-2017	09-08-2017
9087	09-08-2017	09-08-2017
5643	09-08-2017	09-08-2019
45	09-08-2017	09-08-2022
56	10-08-2017	10-08-2017
123	01-01-2015	01-01-2021

 

** Here datatype of PolicyEndDate   is string .i didnot change it.

 

i  want to show only which PolicyEndDate is greater than and equals to  Today