Watch out for documents written in the reign of Charles II.Although he came to the throne in May 1660, after the Commonwealth period, he actually calculated his regnal year as beginning on 30 January 1649, the date of the execution of his father Charles I.Forget about bars, dating clubs, or even meeting someone at your local library.
The Calendar Act 1752 brought about further changes.
Thus the year number did not change until 25 March, so taking 1558 as an example, the dates ran as follows: So if you see a document dated any time between January and 24 March before 1752, be aware that in modern terms, you need to add a year.
In publications you may see this written as January 1750/51, the year as it was known at the time / the year as we know it now.
Counting was done in scores (a score = 20), so you will often come across something like this: xx iiij ( 20 over 4), which means 4 times 20, or four score, which is 80.
Compare this with the modern French word for 80 - quatre-vingts, ‘four twenties’.
1752 was the first year in England to officially begin on 1 January.