As a Coptic Christian, I have grown up following the Coptic calendar. It is a lunar calendar that is used by the Coptic Orthodox Church and is based on the ancient Egyptian calendar. The Coptic calendar has 13 months, with 12 months of 30 days each and an extra month of 5 days. This calendar is very important to the Coptic community, and it is used to determine the dates of important religious events and festivals.