Show Calendar Revised Date Changed New Years Year's Day In 1582 the Julian calendar was replaced by the Gregorian In a proclamation proclamation proclamation proc proc- Issued by Pope Gregory This established January 1 as New Years Year's Day Our present calendar known as the Gregorian calendar Is based upon Pope Gregory's Gregorys Gregorys Gregory's Greg Greg- orys ory's revision of the Julian calendar I and is more nearly in accord with the solar calendar the calendar the error being reduced to only one day in years Protestant states did not adopt the Gregorian calendar until the century It was not until the century that Russia and others others' of the Balkan states decided to do likewise |