I don't know this for sure, but Wikipedia says: "The exact date of Smith's birth is unknown; however, his baptism was recorded on 16 June 1723 at Kirkcaldy." The source for this is the Scottish novelist and journalist who wrote: Buchan, James (2006), The Authentic Adam Smith: His Life and Ideas <http://www.amazon.com/dp/0393061213> , W. W. Norton & Company <http://en.wikipedia.org/wiki/W._W._Norton_&_Company> , ISBN 0393061213 <http://en.wikipedia.org/wiki/Special:BookSources/0393061213> Sumitra Shah