RamCal is a perpetual calendar that gives the day of the week for any given date. It's a universal calendar that converts dates into the following calendars : Gregorian, Julian, Julian with Roman style (kalends, nones, ides), French republican (as well as a simulation of the continuation of this calendar), Jewish and Muslim.

You just have to enter a date in one of these calendars to automatically see the conversion in the other calendars and to see the day of the week for the Julian, Gregorian and French republican calendars.

It can also calculate the following movable Christian holy days : Easter, Ascension, Pentecost and Ash Wednesday; manage the different dates for the beginning of the gregorian calendar; tell the saints for each day (current and traditional dates); tell the french republican feasts; find a day from a given saint name.

• Julian-Gregorian-Dee Date Calculator 4.25
  Windows software to convert between Julian, Gregorian, Dee and Dee-Cecil calendar dates in various formats, and to add and subtract a number of days, weeks, months and years to or...

• Julian Day Converter 1.0
  This utility can convert a gregorian date into julian day format/Modified Julian Day format and vice versa

• Lunar Calendars and Eclipse Finder 10.19
  This software allows you to: (i) Display the current phase of the Moon. (ii) Calculate the phase of the Moon for any time in the past or future within a 9000-year period. (iii) Convert between dates in various calendars : three solar calendars, the...