There was some strangeness in England and its colonies about when the year began. Although January 1 was known New Year's Day, the date the year was changed was March 25, so between 1/1 and 3/25 you have to specify whether it is an Old Style date or a New Style date. That was fixed at the same time England went to the Gregorian calendar.
The strangeness in England and its colonies continues to this day. Nothing so simple as calendars, now.