NAME

     calendar — reminder service

SYNOPSIS

     calendar [-abw] [-A num] [-B num] [-l num] [-e num] [-f calendarfile] [-t [[[cc]yy]mm]dd]

DESCRIPTION

     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:

     -A num  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.

     -B num  Print lines from today and previous num days (backward, past).

     -b      Enforce special date calculation mode for Cyrillic calendars.

     -l num  Print lines from today and next num days (forward, future). Defaults to one. (same as -A)

     -e num  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.

     -f calendarfile
             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

FILES

     calendar              File in current directory.
     ~/.calendar           Directory in the user's home directory (which calendar changes into, if it exists).
     ~/.calendar/calendar  File to use if no calendar file exists in the current directory.
     ~/.calendar/nomail    calendar will not send mail if this file exists.
     calendar.all          International and national calendar files.
     calendar.birthday     Births and deaths of famous (and not-so-famous) people.
     calendar.canada       Canadian holidays.
     calendar.christian    Christian holidays (should be updated yearly by the local system administrator so
                           that roving holidays are set correctly for the current year).
     calendar.computer     Days of special significance to computer people.
     calendar.croatian     Croatian calendar.
     calendar.discord      Discordian calendar (all rites reversed).
     calendar.fictional    Fantasy and fiction dates (mostly LOTR).
     calendar.french       French calendar.
     calendar.german       German calendar.
     calendar.history      Miscellaneous history.
     calendar.holiday      Other holidays (including the not-well-known, obscure, and really obscure).
     calendar.judaic       Jewish holidays (should be updated yearly by the local system administrator so that
                           roving holidays are set correctly for the current year).
     calendar.music        Musical events, births, and deaths (strongly oriented toward rock n' roll).
     calendar.nz           New Zealand calendar.
     calendar.openbsd      OpenBSD related events.
     calendar.pagan        Pagan holidays, celebrations and festivals.
     calendar.russian      Russian calendar.
     calendar.space        Cosmic history.
     calendar.uk           UK calendar.
     calendar.ushistory    U.S. history.
     calendar.usholiday    U.S. holidays.
     calendar.world        World wide calendar.

SEE ALSO

     at(1), cal(1), cpp(1), mail(1), cron(8)

STANDARDS

     The calendar program previously selected lines which had the correct date anywhere in the line.  This is no
     longer true: the date is only recognized when it occurs at the beginning of a line.

COMPATIBILITY

     The calendar command will only display lines that use a <tab> character to separate the date and
     description, or that begin with a <tab>. This is different than in previous releases.

     The Fl t flag argument syntax is from the original FreeBSD calendar program.

     The -l and -e flags are Debian-specific enhancements. Option -e used to be called in Debian, but this
     option is now used differently by upstream. Also, the original calendar program did not accept 0 as an
     argument to the -A flag.

     Using ‘utf-8’ as a locale name is a Debian-specific enhancement.

HISTORY

     A calendar command appeared in Version 7 AT&T UNIX.

BUGS

     calendar doesn't handle all Jewish holidays or moon phases.