The calendar utility checks the current directory or the directory specified by the CALENDAR_DIR
environment variable for a file named calendar and displays lines that begin with either today's date or
tomorrow's. On Fridays, events on Friday through Monday are displayed.
The options are as follows:
-Anum Print lines from today and next num days (forward, future). Defaults to one (same as -l).
-a Process the “calendar” files of all users and mail the results to them. This requires superuser
privileges.
-Bnum Print lines from today and previous num days (backward, past).
-b Enforce special date calculation mode for Cyrillic calendars.
-lnum Print lines from today and next num days (forward, future). Defaults to one (same as -A).
-enum Print lines from today and next num days, only if today is Friday (forward, future). Defaults to
two, which causes calendar to print entries through the weekend on Fridays.
-fcalendarfile
Use calendarfile as the default calendar file. If this file is not accessible, the system-wide
default is used.
-t [[[cc]yy]mm]dd
Act like the specified value is “today” instead of using the current date. If yy is specified,
but cc is not, a value for yy between 69 and 99 results in a cc value of 19. Otherwise, a cc
value of 20 is used.
-w Print day of the week name in front of each event.
To handle calendars in your national code table you can specify “LANG=<locale_name>” in the calendar file
as early as possible. To handle national Easter names in the calendars, “Easter=<national_name>” (for
Catholic Easter) or “Paskha=<national_name>” (for Orthodox Easter) can be used.
A special locale name exists: ‘utf-8’. Specifying “LANG=utf-8” indicates that the dates will be read
using the C locale, and the descriptions will be encoded in UTF-8. This is usually used for the
distributed calendar files. The “CALENDAR” variable can be used to specify the style. Only ‘Julian’ and
‘Gregorian’ styles are currently supported. Use “CALENDAR=” to return to the default (Gregorian).
To enforce special date calculation mode for Cyrillic calendars you should specify “LANG=<local_name>”
and “BODUN=<bodun_prefix>” where <local_name> can be ru_RU.UTF-8, uk_UA.UTF-8 or by_BY.UTF-8.
Note that the locale is reset to the user's default for each new file that is read. This is so that
locales from one file do not accidentally carry over into another file.
Other lines should begin with a month and day. They may be entered in almost any format, either numeric
or as character strings. If proper locale is set, national months and weekdays names can be used. A
single asterisk (‘*’) matches every month. A day without a month matches that day of every week. A
month without a day matches the first of that month. Two numbers default to the month followed by the
day. Lines with leading tabs default to the last entered date, allowing multiple line specifications for
a single date. “Easter” (may be followed by a positive or negative integer) is Easter for this year.
“Paskha” (may be followed by a positive or negative integer) is Orthodox Easter for this year. Weekdays
may be followed by “-4” ... “+5” (aliases last, first, second, third, fourth) for moving events like “the
last Monday in April”.
By convention, dates followed by an asterisk (‘*’) are not fixed, i.e., change from year to year.
Day descriptions start after the first <tab> character in the line; if the line does not contain a <tab>
character, it isn't printed out. If the first character in the line is a <tab> character, it is treated
as the continuation of the previous description.
The calendar file is preprocessed by cpp(1), allowing the inclusion of shared files such as company
holidays or meetings. If the shared file is not referenced by a full pathname, cpp(1) searches in the
current (or home) directory first, and then in the directory /etc/calendar, and finally in
/usr/share/calendar. Empty lines and lines protected by the C commenting syntax (/*...*/) are ignored.
Some possible calendar entries (a \t sequence denotes a <tab> character):
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
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