How to make one date variable from three separate

[cass5957]

I'm really struggling to make one date variable from three separate variables. For instance, I have "BirthYear", "BirthMonth", "BirthDay" as three separate variables, and I need to make them into one "BirthDate" variable. I'm really lost at how to even start this or what to try. Thank you!

[PaigeMiller]

In a DATA step

wanted_date=mdy(birthmonth,birthday,birthyear);
format wanted_date yymmdd10.;