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The Ethiopian calendar (
Like the Coptic calendar, the Ethiopic calendar has 12 months of 30 days plus 5 or 6
In the Gregorian Calendar Year 2015; the Ethiopian Calendar Year 2008 began on the 12th September (rather than the 11th of September) on account of this additional epagomenal day occurring every 4 years.
This date correspondence applies for the Gregorian years 1900 to 2099. The Ethiopian leap year is every four without exception, while Gregorian centurial years are only leap years when exactly divisible by 400; thus a set of corresponding dates will most often apply for a single century. As the Gregorian year 2000 is a leap year, the current correspondence lasts two centuries instead.