Date in Roman numerals

Roman numerals turn up on cornerstones, film credits, watch faces, wedding invitations and tattoos. Enter a date to see it in every common arrangement, and use the box underneath to read numerals back into numbers.

Date

Used for tattoos, wedding stationery, cornerstones and film credits.

In Roman numerals

October 23, 2026 is XXIII.X.MMXXVI.

Day.Month.Year
XXIII.X.MMXXVI
Month.Day.Year
X.XXIII.MMXXVI
Year.Month.Day
MMXXVI.X.XXIII
With slashes
XXIII/X/MMXXVI
Spaced
XXIII · X · MMXXVI
Day alone
XXIII
Month alone
X
Year alone
MMXXVI

Type a numeral such as MCMXCIV.

How the symbols work

  • I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
  • A smaller symbol before a larger one subtracts: IV = 4, IX = 9, XL = 40, CM = 900
  • Otherwise symbols add up from largest to smallest: MMXXVI = 2026

How it is calculated

  • Each part of the date — day, month and year — is converted separately, then joined with a separator.
  • Numerals are built from the largest symbol down, using the subtractive pairs IV, IX, XL, XC, CD and CM.
  • Standard form never repeats a symbol more than three times, so 4 is IV rather than IIII.
  • The reverse converter validates the numeral against the standard pattern before giving a number, so malformed input is rejected rather than guessed.

Where this is used in the real world

  • Tattoos and jewellery engraving, where the date is usually written day.month.year.
  • Wedding invitations, anniversary gifts and commemorative plaques.
  • Reading copyright dates in film credits and dates on buildings and monuments.

Good to know

  • Roman numerals have no zero and no negative numbers, so the system only covers 1 to 3,999 in standard form.
  • Watch faces often use IIII instead of IV for the four o’clock mark. That is a design convention, not standard notation.
  • There is no fixed convention for the order of a Roman numeral date — choose the arrangement that reads best for your purpose.

Questions people ask

How do I write my birthday in Roman numerals?

Enter the date above and copy whichever arrangement you prefer. Day.Month.Year is the most common for tattoos.

Why is 4 written IV and not IIII?

Standard notation uses subtraction for 4, 9, 40, 90, 400 and 900 so no symbol repeats more than three times. IIII survives on clock faces for visual balance.

Can Roman numerals show a year like 2026?

Yes — 2026 is MMXXVI. The system runs out at 3,999, which is MMMCMXCIX.