Assyrian to Coptic Date Converter

Enter a date in the Assyrian calendar and the tool returns the equivalent date in the Coptic calendar using the standard relationship between the two systems.

1. 1

   Step 1

   Enter the complete Assyrian date — day, month, and year.

2. 2

   Step 2

   We anchor each system's epoch, then convert day by day — Assyrian: the Assyrian year = 2026 + 4750 = 6776; Coptic: the Coptic year ≈ 2026 − 284 (it begins ≈ 11 September).

3. 3

   Step 3

   Read the exact Coptic date: a year spanning 365–366 days, counted month by month.

• 1

  Assyrian and Coptic dates do not map one-to-one — the two systems start from different epochs and count leap years differently, so enter the full Assyrian date and read the Coptic equivalent instead of shifting the year by a fixed offset.

• 2

  Leap rules differ between the calendars behind Assyrian–Coptic, so a span that looks like whole years in one system can land a day or two off in another; trust the converted result rather than a fixed mental offset.

• 3

  Enter the Assyrian–Coptic dates in YYYY-MM-DD format to avoid ambiguity — some conventions read 03/04 as March fourth and others as April third, and a swapped month and day silently shifts every result this page derives.

• Epoch offsets are pair-specific: day zero of Assyrian and of Coptic are different dates, and constants borrowed from another calendar pair are silently wrong by days or years. Use the Assyrian → Coptic relation itself, not a remembered number.

• Reversing the direction is a silent trap: converting from the Coptic calendar back to the Assyrian calendar needs the inverse relation, and off-by-one errors cluster at month boundaries where the systems disagree. Verify the round trip returns your original date.