This utility can convert a gregorian date into julian day format/Modified Julian Day format and vice versa. The Julian Day Format counts the day since the 24th november -4713bc. The julian day format is often used in the astronomical section to calculate for example rises.
gedesoft | http://www.im-online-kaufhaus.de/julian-day-converter/juliandayconverter.exe | 859KB | Nov 4, 2005