Roman / Julian Calendar Converter

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Translate any modern date into authentic Roman calendar notation — for example, 'ante diem III Kalendas Martias' (3 days before the Kalends of March). Understand the three reference points: Kalends (1st), Nones (5th or 7th), and Ides (13th or 15th) of each month. Shows the Roman month names (Ianuarius through December), the day of the week in classical Latin (dies Solis, Lunae, Martis, Mercurii, Iovis, Veneris, Saturni), and the Julian Day Number used in astronomy. Convert in both directions — enter a Roman date string or a Julian Day Number to get the Gregorian date.

Cómo usar

1. 1 Enter a Gregorian date using the date picker to see its Roman notation.
2. 2 Read the explanation of which reference point (Kalends, Nones, or Ides) is used and why.
3. 3 Check the Latin day-of-week name and the Julian Day Number shown below.
4. 4 To convert back, type a Roman date string (e.g. 'a.d. III Kal. Mar.') into the reverse field.
5. 5 Toggle the calendar system switch to compare Gregorian and Julian dates for historical periods.

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