In North Korea it is currently the year 109 because their calendar is based on the birth of Kim Il-Sung, the founder of North Korea.
A Calendar is not a thing that actually tells you what day it is. It just gives you a list of options to choose from.
Ethiopia is on a calendar that is seven years behind the rest of the world
Ethiopia is currently in the year 2006 because it has thirteen months in its year.
The so-called "International Fixed Calendar" is a rationalized calendar that has 13 months with 28 days each. Making every month perfectly divisible into 4 weeks and always starting on a Sunday and ending on a Saturday.
The Calendar is as impeccable as it is unreal, substituting as it does a linear, homogeneous, continuous time for a practical time (made up of immesurable islands of duration, each with its own rhythm).

A Calendar is an attempt, underwritten by the principal religions, to make the heavenly bodies keep regular hours.
The ancient Egyptians had 12 months of exactly 30 days each, with five days of partying at the end of the year to bring the total to 365.
A Calendar is a method of reminding us that each day that passes is the anniversary of some perfectly uninteresting event.