To generate a calendar, fill in the form on the left. If the year field is blank, the current year will be displayed in this frame when you press the "evaluate" button. Notice that you can display the type of the calendar being used (either Julian or Gregorian) by selecting one of the options at the bottom of the form.
The hcal program, a command-line utility written by Craig Stuart Sapp based on research collected by Eleanor Selfridge-Field, may be downloaded here. It was created under the auspices of the Center for Computer Assisted Research in the Humanities at Stanford University.
Those dealing with dating problems of a broader scale and from non-Christian venues (antiquity of many kinds; modern Europe; Asia; India; Mayan and Aztec civilizations, the French Revolutionary calendar, and many more) may wish to consider the PC shareware program provided by E.G. Richards, the author of Mapping Time: The Calendar and Its History which is listed in the consulted references for hcal.
Explanation and documentation for the hcal program are given by the sections listed below: