The day after 4 October 1582 was…15 October.
In parts of Europe, adoption of the Gregorian calendar meant ten dates simply disappeared. But countries changed at different times—Britain waited until 1752.
Sometimes even the date needs fact-checking.
www.britannica.com/science/Greg...
britannica.com
Gregorian calendar | Origins, Meaning, Julian Calendar, Start Date, & Facts | Britannica
The Gregorian calendar is the solar dating system now in general use. It was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar. The Gregorian calendar differs from the Julian…