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InterCal is a date conversion program and perpetual calendar. It is not a personal appointment calendar.

The program displays calendars, one month at a time, for any month of any year in any of nine implemented calendar systems. For each day, the corresponding date in any other system can be shown˜thus an entire month is converted at once.

Any single day can be selected and its equivalent listed in all systems. Certain Christian, Jewish, and Islamic holydays can be highlighted if the user wishes.

The implemented systems are: Gregorian, Julian, Western Historical (hybrid Gregorian/Julian), Jewish, Islamic, Chinese, Mayan,

What's New

Version 2.2:
  • InterCal is now a Universal binary.
  • Otherwise it is identical to InterCal 2.1 with one minor exception. The starting point of the Chinese calendar has been changed by exactly one 60-year cycle, to agree with the (correct) results in the Classic version of InterCal (version 1.4.1 which is no longer supported)


Mac OS X 10.4 or later

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4.6 3


Current Version (2.x)


Downloads 4,035
Version Downloads 696
License Free
Date 03 Aug 2011
Platform OS X / PPC 32 / Intel 32
Price Free