This is a simple Java line application to output today's date. "Yahrzeit" is "time of year" in Yiddish, used to remember important dates; I added support for a feature to output events on a given day largely for the purposes of the actual yahrzeit.

To use the remembrance feature, create a readable file called ~/.calendar.

~/.calendar has a series of lines in it, with the format:

date,description

An example .calendar might be:

Tammuz 20,Birthday for Sam Hill July 17,Anniversary Ramadan 4,Birthday, Ali

If the date matches the current day in the Hebrew, Gregorian, or Islamic calendars, the description is output.

Note that the spelling of the Hebrew months is according to the Hebrew Academy; thus, "Tammuz" is used (as opposed to "Tamuz"), although I used Cheshvan instead of Marhesvan as the Academy recommends.

(I was using Marhesvan, but then realized that when I thought of it, it was as "Cheshvan." A TODO is to make it so month names are customizable such that you can use whichever spellings you prefer instead of relying on my inconsistent and non-normalized transliterations.)

For Adar, the number is included; thus, "Adar 5" will not match, but "Adar I 5" will.

Note that for events in Adar II, matching will be inconsistent, because Adar II is intercalatory; it's not present in every year. The matching algorithm is brute-force, not an actual matching algorithm based on calendar dates.

The algorithms are taken from http://people.sc.fsu.edu/~jburkardt/cpp_src/calendar_rd/calendar_rd.cpp. The date support was originally taken from Joda-time, but this created a large executable jar file, and using my own date classes was shorter (and more clear). (I also didn't want to write a Hebrew chronology for Joda-time or Threeten, because I don't think I understand what the chronologies need to support.)