About this tool
Roman Numeral Date Converter turns any calendar date into the Roman-numeral string you would carve on a cornerstone, etch on a wedding band, print at the bottom of a copyright line, or take to a tattoo artist. Pick a date with the native date picker, choose the part order (Day-Month-Year for the international convention, Month-Day-Year for the US convention, or Year-Month-Day for ISO order) and a separator (period spaced, period, slash, dash, plain space, or a centered middle dot), and the tool builds the primary string plus every other common layout in parallel: a dot-separated DMY string, the US MDY equivalent, an ISO-style YMD string, a slash form for jewelry, a dash form for short labels, a stacked tattoo-style block with each part on its own line, a no-separator compressed form, a long named-month form (V April MMXXV), a short named-month form (V Apr MMXXV), an ISO-padded YMD-with-hyphens form, and a year-only string for movie copyright lines. Every part is shown alongside its Arabic equivalent in the day/month/year cards so the math is transparent. The reverse mode goes the other way: paste any Roman-numeral date in any reasonable format (spaces, dots, slashes, dashes, middle dots, even the word 'of' or stray Arabic digits act as separators) and the parser tokenizes the three parts, decodes each token using strict canonical subtractive notation, and reports every valid year/month/day arrangement consistent with the three values. When the three parts could be combined more than one way (a common situation when day, month, and year all happen to be small), the parser surfaces every valid arrangement in a side-by-side table so you can pick the order used by the source. Year range is 1 to 3999 (MMMCMXCIX), the standard letter-only Roman maximum, which covers every modern date including historical dates back to the Year of the Four Emperors. Useful for designers laying out invitations, brides and grooms picking wedding-date stationery, tattoo artists and their clients double-checking the math before the needle goes in, copywriters formatting a film copyright line, students decoding a Latin inscription on a building, and anyone who has typed 'date in roman numerals', 'today in roman numerals', 'roman numeral wedding date', 'what does mmxxv mean', or 'roman numeral date tattoo' into a search bar. All conversion runs locally in your browser; the dates you enter here never leave your device.
Free to use. Works in your browser. No signup, no login.