These calculators convert dates between Gregorian and Coptic calendar systems.
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The Coptic (Egyptian) calendar is an evolution of the Ancient Egyptian Calendar. It has the same month structure (12 months of 30 days each) and differs by an additional day in the intercalary month. The additional day is added every 4 years, just like in Julian calendar. So the intercalary (13th) month consists of 5 days in an ordinary year and 6 days in a leap year.
The additional day was introduced by the Ptolemy III (Egyptian pharaoh 246-222 BCE) in 238 BCE, but it was sabotaged by priests and people and abandoned until 25 BCE.
The Coptic calendar has 7-day week since about 3 century CE, for thousands of years before the Egyptians used 10-days decades instead of weeks.1
The calendar is still used by the Coptic Orthodox Church and used by the farming populace in Egypt. Coptic years are counted from August 29th, 284 CE 2, the year Diocletian became Roman Emperor.
The calculator below converts a Coptic date to a Gregorian date.
The following calculator performs the inverse conversion from a Gregorian date to a Coptic calendar date.
The Coptic calendar summary
|Days in a year||365.25|
|Effective date||1st century CE|
|End date||19th century CE, still in use by the Coptic Orthodox Church|
|Epoch (Julian)||August, 29th, 284|
|Days in a week||7|
|Days in a year||365, 366|
|Days in a month||30, 5, 6|
|Leap year||every 4th year is leap|
|Previous calendar||Ancient Egyptian Calendar|
|Next calendar||Gregorian calendar|
Month names 3
|Month #||Month name||Days|
|13||Nissieh (The small month)||5 (6)|
Week day names2
|Day #||Day name||Gregorian calendar day name|