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Date to Roman Numerals Converter

Choose a month, a day and a year and this tool writes that date in Roman numerals. You decide the order of the three parts and what goes between them.

About this converter

Pick the month from the month list, pick the day from the day list and type the year into the number field, then press Convert. Roman numerals write numbers with letters, so the date comes back as three numeral groups: the month, the day and the year.

The Format field sets which part comes first: MM.DD.YYYY starts with the month, DD.MM.YYYY starts with the day and YYYY.MM.DD starts with the year. The Delimiter field sets what sits between the parts: a dot, a middot, a slash, a space or a dash.

Nothing is worked out until you press Convert, and the answer then shows in cards below the button, where it can be copied. For October 15, 1999 the three formats give X.XV.MCMXCIX, XV.X.MCMXCIX and MCMXCIX.X.XV.

Date to Roman numerals formula

The date is handled as three separate numbers, and each one is turned into Roman numerals on its own. Those three results are then joined in the order set by Format with the chosen delimiter between them, so the order and the separator change the layout but not the numerals themselves.

May 21, 2024 works out as 05/21/2024 = V.XXI.MMXXIV. July 4, 1776 gives VII.IV.MDCCLXXVI with a dot, and VII·IV·MDCCLXXVI with a middot.