Calendars & Dates » Calculators & Converters

Parallax View - Date-Subtraction Calculator

Subtracts two Gregorian dates and returns the number of intervening days. A special calendar control makes selections of the dates easy.

Regnal Year Calculator

Rosetta Calendar - A Calendar Conversion Service

Scott Lee's free on-line service for converting to/from dates in Gregorian, Julian, French republican and Jewish calendars.

The Gregorian Conversion | Polysyllabic

Background information from A History of the Western Calendar.

Tom Nunamaker's Census Age Calculator

For UK census years.