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It depended on which country the specific territory was owned by.Texas, Florida, California, Nevada, Arizona, and New Mexico all switched with Spain in 1582 (although one report I read stated that the Spanish colonies didn't switch until two years after Spain).This application deals with only two: the Gregorian calendar, now used universally for civil purposes, and the Julian calendar, its predecessor in the western world.As used here, the two calendars have identical month names and number of days in each month, and differ only in the rule for leap years.This means that the year 2,100, for example wouldn't be a leap year whereas in the Julian calendar format - it would be.So, the difference in the two calendar formats do not seem to be very profound.However, historians, scribes, statisticians, and weather experts for example, are very well aware of any changes in calendars and dates. The time periods vary as to when countries migrated from the Julian to Gregorian calendar.Spain, Italy, and France for example switched over in 1582.
Note that the time scale that is the basis for Julian dates is Universal Time, and that 0h UT corresponds to a Julian date fraction of 0.5.Great Britain didn't switch over to the Gregorian until 1752.Other countries didn't switch over until more recent times - Greece for example was using the Julian all the way up until 1922.But as a result of the switch from the Julian calendar to the Gregorian one, his birthday was in fact February 23 in the 19th century, February 24th in the 20th and 21st century, and will continue to advance in future centuries.
But his successor, Augustus Caesar, made some refinements to the calendar, and it was Augustus's refinements that would become known as the Julian calendar and be used world-wide for the next 16 centuries.It is assumed that 7-day weeks have formed an uninterrupted sequence since ancient times.