How the Roman Numeral Date Converter works

Each line of input is recognized automatically. A string made only of Roman letters is decoded to a number, a plain integer is encoded as a Roman numeral, and a date is converted part by part. Slash dates such as 3/10/2026 can be read as day first or month first, which you choose in the settings.

The output order can be day month year, month day year, or year month day, joined by a dot, hyphen, slash or space. The standard range for Roman numerals is 1 to 3999, so years outside it are left in digits.

When it is useful

• •Designing a tattoo, a wedding invitation or a monument inscription with a date.
• •Writing a copyright year or a film style date in Roman numerals.
• •Checking a numeral you found on a clock, a building or a book page.
• •Learning how the subtractive forms such as IV and CM work.

Frequently Asked Questions