Coptic Time
Ethiopia has 13 months in a year. This is because they have adopted the Coptic calendar. The Coptic calendar has 12 months of 30 days each and the 13th month has 5 days, or 6 days during a leap year. The Ethopian new year starts on 11 September. (http://bit.ly/2T5Ra6z, http://bit.ly/3clbOHJ)
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Andrew Fulton