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Roman Date Converter

Convert Latin calendar expressions such as Idus Martiae, Pridie Kal. Aprilis, or a.d. VIII Kal. Aprilis into modern readable dates.

Input

Enter a Roman or Latin expression and the historical year.

Examples

Result

Julian calendar result
14 March 44 BCE
Gregorian equivalent
12 March 44 BCE
How this was computed

For Ides, the conversion rule is day = 15 - 2 + 1.

Notes for users

  • Roman dates use inclusive counting, so the target day is counted in the total.
  • March, May, July, and October use Nones on the 7th and Ides on the 15th.
  • Other months use Nones on the 5th and Ides on the 13th.
  • This tool is designed for standard Roman and Latin documentary forms.

Production notes

  • No database is required for the conversion engine.
  • The app can be deployed directly to Vercel from a GitHub repository.
  • For wider scholarly coverage, add more medieval spelling variants and tests.
  • For SEO, customize metadataBase and add a real domain after deployment.