Easy Datum Converter is a program to perform arithmetical operations with Common Era (Gregorian) and Julian dates, Julian day numbers and ordinal dates of the form yyyy-ddd. It is a bilingual English/German program.

Suppose you run an advertisement which expires 45 days from today. What Datum will that be? How many weekdays are there in 2006? If you have an investment which matures on June 30th, 2007, how many days away is that? When will be (or was) the 10,000th day in your life? How many years, months and days until December 21st, 2012? If you find this sort of calculation a tad difficult then this program will make it easy.

Easy Datum Converter provides four calendrical operations:

1. Calculation of the number of days from one Datum to another.
2. Addition of a number of days to a Datum and subtraction of a number of days from a Datum.
3. Interconversion among Gregorian (a.k.a. Common Era) dates, Julian Calendar dates, ordinal dates in the form yyyy-ddd and Julian day numbers.
4. Display of a month in any year according to either the Common Era Calendar or the Julian Calendar.

Weekend days may be included or excluded in Datum calculations.

The program supports batch computation using predefined operations in an input file.