Not quite that simple. It depends on what country you’re talking about. For example, in Greece it happened in 1923. If I recall by then it was 13 days.

1752 is when Great Britain and its colonies adopted the Gregorian Calendar.

https://en.m.wikipedia.org/wiki/Gregorian_calendar#Adoption

Proper calendar reform would return New Years Day (Spring Equinox, currently 21st March) to 1st March. That would also have the extra advantage of relocating months seven (September), eight (October), nine (November) and ten (December) back into their original place in the calendar year.

Just run the following command in your terminal: "cal 9 1752"