To solve the problem, Pope Gregory XIII created what is known as the Gregorian calendar.
This new calendar changed the first day of the year to January 1 and also jumped ahead by 10 days to make up for the lost time.
For this reason, many people wrote dates falling between January 1 and March 25 with both years, as in the following examples.
By the time England and the colonies adopted the new calendar, the discrepancy between the calendars was eleven days.
By the Julian calendar, March 25 was the first day of the year and each year was 365 days and 6 hours long.