Roman date tool
Convert any Gregorian date from year 1 to 3999 into standard Roman numerals, then parse it back with strict validation.
Roman date
MMXXVI.VI.XX
Parsed date
2026-06-20
Strict mode rejects forms such as IIII, VV, IC, and repeated subtractive pairs.
Roman numeral dates are most familiar on copyright pages, end cards, and production credits. They turn a plain year such as 2026 into MMXXVI, giving a book, programme, or film a formal colophon style while still preserving the legal year. Publishers often use them as a visual convention rather than a different calendar: the date is still Gregorian, only the digits have changed.
British TV viewers also associate the style with the BBC convention of showing a copyright year in Roman numerals at the end of a programme. Film and television credits use the same trick because a compact Roman year can look less commercial than Arabic numerals and sits neatly with studio marks, rights notices, and archival slates.
Full dates need a little more care. Standard Roman numerals have no zero, so months and days are written from I to XII and I to XXXI, while years are normally limited to I through MMMCMXCIX. This converter uses subtractive notation, so 4 is IV, 9 is IX, 40 is XL, 90 is XC, 400 is CD, and 900 is CM. The reverse parser rejects casual alternatives such as IIII or VV, which keeps copied copyright-page dates consistent.