Adam Smith’s 294th birthday.
An alternate calendar convention puts his birthday on June 16, 1723; the difference has to do with whether you do (June 16) or do not (June 5) adjust his birthday to reconcile it with the adoption of the Gregorian (Continental) calendar in England on 1 January 1752. To align the two, the English calendar was advanced by 11 days, so Wednesday 2 September 1752 was followed by Thursday 14 September 1752.