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The Feast of Neyrouz marks the first day of the Coptic year. Its celebration falls on the 1st day of the month of Thout, the first month of the Coptic year, which for AD 1901 to 2098 usually coincides with 11 September, except before a Gregorian leap year when it is September 12. Coptic years are counted from AD 284, the year Diocletian became Roman Emperor, whose reign was marked by tortures and mass executions of Christians, especially in Egypt.
Every fourth Coptic year is a leap year without exception, as in the Julian calendar, so the above mentioned new year dates apply only between AD 1900 and 2099 inclusive in the Gregorian Calendar. In the Julian Calendar, the new year is always 29 August, except before a Julian leap year when it's August 30. Easter is reckoned by the Julian Calendar in the Old Calendarist way.