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Julian calendar dating
The Gregorian Calendar was first introduced in 1582 in some European countries (*).
However, many countries used the Julian Calendar much longer.
Each country is listed by its current name although its official name may have changed since the calendar reform.
The delay in switching meant that different countries not only followed different calendars for a number of years but also had different rules to calculate whether a year was a leap year.
However, the later the switch occurred, the more days had to be omitted. This created short months with only 18 days and odd dates like February 30 during the year of the changeover.
In North America, the month of September 1752 was exceptionally short, skipping 11 days.
If you are performing date calculations in World Writer, you may be required to use the Julian date value.
These conversion charts will assist in determining the value to enter.However, the difference will become 14 days in 2100.The Gregorian Calendar, also known as the Western or Christian Calendar, is the most widely used calendar in the world today.This explains why the years 1700, 1800, and 1900 were leap years in countries still using the Julian calendar (e.g.Greece), while in countries that had adopted the Gregorian calendar (e.g. Sweden and Finland had a "double" leap year in 1712.Its predecessor, the Julian Calendar, was replaced because it did not properly reflect the actual time it takes the Earth to circle once around the Sun, known as a tropical year.The reason the Julian Calendar had to be replaced was the formula it used to calculate leap years.To get the calendar back in sync with astronomical events like the vernal equinox or the winter solstice, a number of days were dropped.The papal bull issued by Pope Gregory XIII in 1582, decreed that 10 days be dropped when switching to the Gregorian Calendar.Today's Gregorian calendar uses more accurate leap year formula, making it far more accurate than the Julian. Compared to the tropical year, it is off by one day every 3236 years.This Revised Julian calendar uses even more complex rules to determine when to add a leap day.