Gregorian to Coptic date converter
The Coptic calendar is used by the Coptic Church and known to farmers in Egypt; this tool gives the Coptic date for any Gregorian day.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter gregorian date.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
A Coptic year has 12 months of 30 days plus Nasie of 5 days, or 6 when year mod 4 = 3. Julian Day Number = 1825029 + 365 × (year minus 1) + floor(year / 4) + 30 × (month minus 1) + day.
Example
Inputs: Gregorian date = 2026-09-11. Result: Converted date: 1 Thout 1743 AM; Day: 1; Month name: Thout.
Limits and caveats
- Range 1900 to 2100.
- The Church may keep some feasts on a slightly different Coptic day in the years after a leap year.
Questions about this tool
When does the Coptic year start?
At Nayrouz, 1 Thout, which is 11 September, or 12 September when the next Gregorian year is a leap year.
Why is it called the Era of Martyrs?
The count starts in 284 CE, the first year of Emperor Diocletian, who persecuted Christians in Egypt.
What is the month of Nasie?
It is the short 13th month at the end of the year: 5 days normally and 6 in a Coptic leap year.