Paganlink : Software : Mac Calendar : InterCal


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This is the third public release of InterCal, a freeware date conversion, calendar comparison, and holiday calculation program. It is not a daily appointment calendar. It displays calendars, one month at a time, for any month of any year in any of several calendar systems. For each day in the displayed month, corresponding dates in another calendar system can be shown. For any selected single day, the corresponding dates in all implemented calendar systems can appear in a separate window.

Calendar systems implemented are: Julian, Gregorian, "Western Historical" (a cross between the Julian and Gregorian), Jewish, Islamic, the Elliott Super (invented by the author of InterCal), Mayan, and the French Revolutionary calendar (the official calendar of France for a few years after the Revolution).

Certain religious holy days and festivals are highlighted (under user control) when they occur in a displayed month, regardless of which calendrical system is in use at the time. Some which can be highlighted are Easter, Rosh Hashonah, Hanukah, 'Id al-Fitr, and the first day of Ramadan.


InterCal was designed with 16-inch or larger monitors in mind. But smaller monitors can be used if one is willing to scroll around the display. InterCal exists in a 680x0 version only (no native Power PC version).

InterCal requires System 6 or later (it uses pop up menus) and 32-bit QuickDraw. Actually, it will run without 32-bit QuickDraw with some annoying but non-fatal display anomalies.

InterCal was developed and tested on a Mac IIci running System 7.1. It has been run and casually tested on several other machines (MacPlus, PowerBook, Centris, Performa, PowerMac) running System 6.0.5, System 7.0.1, System 7.1, and System 7.1.2.

Printing has been tested on an NEC Silentwriter Model 95 laser printer using both LaserWriter 7 and LaserWriter 8 drivers. It has also been tested on an HP PaintJet using the driver provided by HP. It has never been tested on a QuickDraw printer (such as the ImageWriter).

It requires 730K to run.


Denis A. Elliott


Freeware. No one may distribute InterCal for profit in any form, including (but not limited to) electronic information service distribution, bulletin board distribution, and magnetic or optical medium distribution. Non-profit distribution of the software is fine, providing that the software is not modified in any way, and the complete works and documentation of the software are included in the distribution package.

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