Only Italy, Poland, Portugal and Spain went along with the new calendar immediately. One by one other countries adopted it in different years.
The rest of the world was reluctant to change the calendar and only gradually implemented it, some in the 20th century. There are even groups today, such as Greek Orthodox church, Russians and Muslims who don’t use the Gregorian calendar.
Britain and its territories (including its colonies that later became USA and Canada) adopted the Gregorian correction in 1752-09. By then, 11 days had to be dropped. 1752-09-03 to 1752-09-13 never happened.
The Gregorian calendar corrects the length of the year to year to 365.2425 days. It gets ahead 1 day every 3289 years.
BigDate will use either Pope Gregory’s correction or the British one, depending on which you configure.
You can configure the flip-over date from Julian to Gregorian with GregorianCalendar. setGregorianChange. By default the date is Pope Gregory’s 1582-10-05
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