I'm sure this must have been discussed before, so I'm happy if someone can point me to the appropriate thread (I've searched unsuccessfully).
I know that in England the Calendar Act 1751 changed the first day of each year from 25 March to 1 January, so that the day after 31 December 1751 was 1 January 1752 (and not 1 January 1751 as it would have been under the old system). Therefore, 1751 ran only from 25 March to 31 December.
My question is how family historians deal with this anomaly in recording data. Should we use the current convention of starting a year on 1 January, so that even before 1752 we should show the hypothetical 10 January as being in the "New" year?
I also believe that Scotland had changed the first day of the year to 1 January in 1600, so presumably the two countries were operating different calendars for over 150 years, and the same day - eg 10 January - would be recorded as being in a different year in each country. So the same question as for England above applies in Scotland for 1600, although I guess not many of us will have detailed records for that time period anyway.