Not a country, but Foula still uses the Julian calendar
Before the introduction of the Gregorian Calendar in 1582, most of the world that now uses the Gregorian Calendar was using the Julian Calendar.
The name of Caesar's calendar was the Julian calendar. It was replaced in 1582 by the Gregorian calendar, which we used today.
Although the Julian calendar is still used in some places the Gregorian calendar has almost completely replaced it throughout the world.The Julian calendar had a leap year every four years. The problem is that this has a year that is slightly too long. To fix this problem, the Gregorian calendar added exceptions. In the Gregorian calendar, the rule is this:Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100; the centurial years that are exactly divisible by 400 are still leap years. For example, the year 1900 was not a leap year; the year 2000 was a leap year.There are still some Orthodox parishes in eastern Europe which still use the Julian calendar. Greece was one of the last Western countries to convert to the Gregorian calendar, in 1925. The isolated Greek monastic community on Mount Athos retains the Julian calendar. Berbers in North Africa still use the Julian calendar for agricultural purposes.
The Julian Calendar was initiated by Julius Ceaser in 45B.C.
The Julian Calendar is named for Julius Caeser.
Since Serbia uses the Julian calendar, Christmas is on January 7.
the Roman calendar
2012 in the Julian calendar is a leap year that begins on a Saturday and ends on a Sunday. 1 Jan 2012 in the Julian calendar is 14 Jan 2012 in the Gregorian calendar.
the Gregorian calendar
The Julian calendar begins on January 1st. next January 1st will be 1001.
The civil version of the Julian calendar is based on the su, and so it is solar. However, the Julian calendar includes an undated lunar calendar that allows it to calculate when Easter is, so it is lunisolar.