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Old Style and New Style dates

Old Style and New Style dates
(O.S.) Adam Ferguson, Scottish philosopher and historian (d. 1816)

Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923.

20 June 1723

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Born on the same birth day (20 June): A-FÜ • Byron Farwell • Dick Reynolds • Gian Galeazzo Sforza • James Tolkan • Lillian Hellman • Old Style and New Style dates • Princess Amalie of Hesse-Darmstadt • Sheila McLean • Sohn Suk-hee • Terence Young (director)

Born in the same month (June 1723): Adam Smith • Giovanni Antonio Scopoli • Johann Georg Palitzsch