toDate from Numeric Variables

I am trying to convert numeric variables to a date:
curMonth = 2curDate= 15curYear = 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.
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