Easy Date Converter is a program to perform arithmetical operations with Gregorian, Julian and Annus Novus dates and Julian day numbers. (It is a trilingual English/German/Spanish program.)

Easy Date Converter provides three calendrical operations:

1. Calculation of the number of days between two dates. 2. Addition or subtraction of a number of days to or from a date. 3. Interconversion among Gregorian (a.k.a. Common Era) dates, Julian Calendar dates, dates in the Annus Novus Calendar, Julian day numbers and dates in the form yyyyddd (sometimes erroneously called "Julian dates")