The adoption of the Gregorian Calendar has taken place in the history of most cultures and societies around the world, marking a change from one of various traditional dating systems to the contempora
Lunario Novo, Secondo la Nuova Riforma della Correttione del l'Anno Riformato da N.S. Gregorio XIII, printed in Rome by Vincenzo Accolti in 1582, one of the first printed editions of the new calendar.
William Hogarth painting: Humours of an Election (c. 1755), which is the main source for the "Give us our Eleven Days" mythical riots.
Swedish Almanach of 1753
Gravestones at Feriköy Cemetery in Istanbul with Hijri birth years and Gregorian death dates
Old Style and New Style 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 var
Memorial plaque to John Etty in All Saints' Church, North Street, York, recording his date of death as "28 of Jan: 170+8/9"
Thomas Jefferson's tombstone. Written below the epitaph is "Born April 2. 1743. O.S. Died July 4. 1826."
Issue 9198 of The London Gazette, covering the calendar change in Great Britain. The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752" (in fact 5 days).