get the selected week start date and end date current month

not from database no db required i just added 6weeks to dropdown in my dropdown if i select week1 below show the text week1 start date and end date has to show this current month only 

 

my quetion is how should i pass week value to get that week start and end date

 

 

The above output displaying current week start and end dates only 

Hi ejaz mizra,