Estilo Antiguo y Estilo Nuevo

Estilo Antiguo (en inglés Old Style, abreviado O.S.) y Estilo Nuevo (New Style, abreviado N.S.) indican sistemas de datación antes y después de un cambio de calendario, respectivamente. Por lo general, este es el cambio del calendario juliano al calendario gregoriano tal como se promulgó en varios países europeos entre 1582 y el siglo XX.

En Inglaterra, Gales, Irlanda y las colonias americanas de Gran Bretaña, hubo dos cambios de calendario, ambos en 1752. El primero ajustó el inicio de un nuevo año desde Lady Day (25 de marzo) al 1 de enero (lo que Escocia había hecho desde 1600), mientras que el segundo descartó el calendario juliano en favor del calendario gregoriano, eliminando 11 días del calendario de septiembre de 1752 para hacerlo.^[2]^[3] Para acomodar los dos cambios de calendario, los escritores usaron la datación dual para identificar un día dado dando su fecha de acuerdo con ambos estilos de datación.

Para países como Rusia, donde no se realizó ningún ajuste de inicio de año, O.S. y N.S. simplemente indican los sistemas de datación juliana y gregoriana. Muchos países ortodoxos orientales siguen utilizando el antiguo calendario juliano con fines religiosos.

↑ «The London Gazette |From Tuesday September 1 O.S. to Saturday September 16 N.S. 1752». London Gazette (9198): 1. 1 de septiembre de 1752.
↑ Poole, 1995, pp. 95–139.
↑ Spathaky, Mike Old Style and New Style Dates and the change to the Gregorian Calendar. "Before 1752, parish registers, in addition to a new year heading after 24th March showing, for example '1733', had another heading at the end of the following December indicating '1733/4'. This showed where the Historical Year 1734 started even though the Civil Year 1733 continued until 24th March. ... We as historians have no excuse for creating ambiguity and must keep to the notation described above in one of its forms. It is no good writing simply 20th January 1745, for a reader is left wondering whether we have used the Civil or the Historical Year. The date should either be written 20th January 1745 OS (if indeed it was Old Style) or as 20th January 1745/6. The hyphen (1745-6) is best avoided as it can be interpreted as indicating a period of time."

[1] «The London Gazette |From Tuesday September 1 O.S. to Saturday September 16 N.S. 1752». London Gazette (9198): 1. 1 de septiembre de 1752.

[FOOTNOTEPoole199595–139-2] Poole, 1995, pp. 95–139.

[MS2-3] Spathaky, Mike Old Style and New Style Dates and the change to the Gregorian Calendar. "Before 1752, parish registers, in addition to a new year heading after 24th March showing, for example '1733', had another heading at the end of the following December indicating '1733/4'. This showed where the Historical Year 1734 started even though the Civil Year 1733 continued until 24th March. ... We as historians have no excuse for creating ambiguity and must keep to the notation described above in one of its forms. It is no good writing simply 20th January 1745, for a reader is left wondering whether we have used the Civil or the Historical Year. The date should either be written 20th January 1745 OS (if indeed it was Old Style) or as 20th January 1745/6. The hyphen (1745-6) is best avoided as it can be interpreted as indicating a period of time."

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