When Was The Change Over From Julian To The Gregorian Calendar?

The Gregorian calendar is the one commonly in use today.
It was initially proposed by Aloysius Lilius, a physician from Naples. Pope Gregory XIII under instruction from the Council of Trent (1545-1563) was responsible for the correction of errors in the Julian calendar.
The change to the Gregorian calender was decreed by Pope Gregory XIII in a papal bull in February 1582.
This papal bull of February 1582 decreed that 10 days should be dropped from October 1582 so that 15 October should follow immediately after 4 October, and from then on the reformed- Gregorian calendar should be used.
This was used in Italy, Poland, Portugal, and Spain with other Catholic countries adapting to it soon after.
Protestant countries were reluctant to change from the Julian calender and the Greek orthodox countries didn't change for many years. Countries who delayed the change-over beyond 1700 AD had to add eleven days as they had inserted an extra leap year.

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