calendar — reminder service

Some possible calendar entries

LANG=C
Easter=Ostern

#include <calendar.usholiday>
#include <calendar.birthday>

6/15\tJune 15 (if ambiguous, will default to month/day).
Jun. 15\tJune 15.
15 June\tJune 15.
Thursday\tEvery Thursday.
June\tEvery June 1st.
15 *\t15th of every month.

May Sun+2\tsecond Sunday in May (Muttertag)
04/SunLast\tlast Sunday in April,
\tsummer time in Europe
Easter\tEaster
Ostern-2\tGood Friday (2 days before Easter)
Paskha\tOrthodox Easter

My config ~/.calendar/calendar file

#include <calendar.ukrainian>

~/.calendar/calendar - File to use if no calendar
file exists in the current directory.