Ethiopian calendar consists of 13 months. A 365-day calendar cycle of the year with 13 months still protected from occurring. Just a few important that need your attention, again, except in a situation does not create a disadvantage to use the calendar as we know it. Official correspondence, Bank cheques, promissory note, and in official documents such as billing must be considered. Especially in America or in a written document that is used in documents written in the Latin alphabet in the Ethiopian calendar, the calendar as we know it is used in that you need to pay attention them.