Old Style and New Style dates

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.

21 June 1881

Born on the same birth day (21 June): Irving Fein • Joe Flaherty • Karl Zittel • Ludwig Lange (physicist) • Michel Platini • Mike McCormack (American football) • Reinhold Niebuhr • Trond Kirkvaag

Born in the same month (June 1881): Curt Sachs • George Shiels • Harry Frazee • Kesago Nakajima • Maggie Gripenberg • Maginel Wright Enright • Mikhail Larionov • Mordecai Kaplan • Spiros Xenos • Tommy Burns (Canadian boxer) • Walter Egan (golfer) • Ya'akov Cahan • Zoltán Halmay