concatenation in derived column trasnformation using existing columns ssis

Hi,

i am loading data from excel file and i wanted create the column named load_date in derived column transformation,for that load_date column i wanted to create the the expression ,i have already two columns in excel Year and month,

year is like 2018,and month like 'November' ,and using this two columns i wanted to get the result as '2018-11-09',

and for day part what to do.

could any one tell me how to concatenate this .

thanks,