toDate from Numeric Variables

toDate from Numeric Variables

I am trying to convert numeric variables to a date:

curMonth = 2
curDate= 15
curYear = 2013

Date1= (curMonth+curDate+curYear).toDate()

I have also tried

Date1= (curMonth+curDate+curYear).toString().toDate()

In my script i just keep getting error that it couldn't convert variable to a date.  Can someone please help.  Thank you.