Gregorian calendar implemented

On October 15, 1582, the Gregorian Calendar was implemented, following a papal bull issued by Pope Gregory XIII. Spain, Portugal, Poland, and Italy were the only nations to adopt the calendar on this day, but it spread over the succeeding centuries to become the international standard today.

Learn more
about the history of the Gregorian calendar and view its dates of adoption throughout the world.


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This Day at Law is JURIST's platform for legal history, highlighting interseting and important developments that shaped the law and the world.

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