on the chassis (open hood and look straight down and to left should be a yellow or white sticker)
or safer and for sure way is pm Anna or CamaroScotty like Envy said..
I was told that the date on the sticker on the chassis was when the chassis was built and not the actual build date of the car. I'll look and compare mine just to see if I was correctly informed...lol.
Okay...I checked this morning and my chassis is dated 4/13/2010 but my car's build date is 4/14/2010 so the chassis date IS NOT the build date of your car but it's close. And a whole lotta people think they know their car's build date but they're off by a day or two...lol.