custom date time !

Question

i have 2 drop month and year ddlmoth and ddl year 

 

i want date time as (current day - ddlmonth - ddlyear) 

 

for eg 02-05-2019

 

05 and 2019 will be dropdown selected and 02 will be the current day of the system.

 

i had tried  

 

 

Datetime date = new Datetime(year , month, currentday)

 but it is giving error as unrecognise time