Also in Colonial America, and throughout the British Empire worldwide, and is why our Framers had two different birthdates. The adoption of the Gregorian calendar happened at different times in different places. In one of the Scandinavian countries (can’t remember which one) it was adopted once, then rescinded, then adopted with alterations, then the alterations got ironed out. It makes genealogy a bit challenging at times.
https://www.familytreemagazine.com/history/gregorian-calendar-adoption-map/
A scene from the Ye Olde Mitre tavern, Holburn, London, Sept. 14, 1752:
“Checking out, sir?”
“Why, yes.”
“Very well. Here’s your bill.”
“Thank you. Wait, what? 5,724 shillings? I only got here yesterday!”
“That’s right sir, you checked in yesterday, Sept 2, and you’re checking out today, Sept 14.”
There is also the change of which calendar day is the New Year's Day. Prior to 1752 it is March 25. Beginning in 1752 it is January 1. So be careful calculating age at death, for example, when the dates include first quarter dates before 1752.
https://en.wikipedia.org/wiki/New_Year%27s_Day#Great_Britain_and_the_British_Empire