Coptic Day of the Week Finder

Enter the date values and the tool computes the result for the coptic calendar system.

1. 1

   Step 1

   Enter your date in the Coptic calendar: day, month, and year.

2. 2

   Step 2

   We walk the real Coptic calendar — 12 × 30-day months plus 5–6 short epagomenal days — instead of a flat 30-day-month average.

3. 3

   Step 3

   The output breaks down years, months, and days on real Coptic lengths.

• 1

  This Coptic Day of the Week Finder follows Coptic calendar rules — its own epoch, month lengths, and leap years — so the result can differ from a Gregorian-based calculation of the same date; treat the calendar system as part of the input.

• 2

  For deadlines tied to authorities or contracts, confirm which calendar the deadline officially uses before converting it here — a Coptic date read in the wrong system can be off by days or even a full year.

• 3

  Watch century boundaries and very old dates in the Coptic system: historical calendars dropped or added days when they were adopted, which is invisible in daily use but material for long-range historical calculations here.

• Year-length drift compounds quietly: a Coptic year averages about 365 days, so the same month-day is a different day count every year and a weekday lookup from one year cannot be scaled to another. Recompute across the exact years involved.

• Epochs are not interchangeable: every calendar owns its day zero, and year arithmetic borrowed across systems shifts a weekday lookup by years. Confirm the coptic epoch (the Coptic year ≈ 2026 − 284 (it begins ≈ 11 September)) before comparing dates.