What is the Coptic Calendar?

The Coptic calendar preserves a 13-month structure derived from Egyptian/Alexandrian traditions and is closely related in structure to the Ethiopian calendar.

How the calendar is structured

12 months of 30 days plus a short 13th month of 5 or 6 days.

Where and why it is used

Region: Coptic Christian communities. Primary context: Coptic liturgy and feast dating.

History and development

The system belongs to the Late Antique to Modern layer of the archive. Its origin is summarized as Alexandrian / ancient Egyptian lineage. CalculatorWiser separates historical reconstruction, religious observance, civil use, and modern technical standards so different systems are not treated as though they all work the same way.

Visual reference gallery

Conversion and accuracy notes

Some calendar systems can be converted deterministically with modern algorithms. Others depend on observation, local authority, historical reconstruction, or regional practice. CalculatorWiser marks those distinctions rather than presenting uncertain dates as exact.

Research trail

This entry is part of the research-backed World Calendar Archive. Primary research anchor for this entry: Coptic chronology references.