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The utility checks the current directory or the directory specified by the environment variable for a file named
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 Process the files of all users and mail the results to them. This requires superuser privileges.
  • num Print lines from today and next days. Defaults to one.
  • b Enforce special date calculation mode for KOI8 calendars.
  • num Print lines from today and previous days. Defaults to zero.
  • calendarfile Use
as the default calendar file.
  • num Print lines from today and next days. Defaults to one.
  • num Print lines from today and next days, only if today is Friday. Defaults to two, which causes calendar to print entries through the weekend on Fridays.
  • t Act like the specified value is instead of using the current date.
  • To handle calendars in your national code table you can specify in the calendar file as early as possible. To handle national Easter names in the calendars, (for Catholic Easter) or (for Orthodox Easter) can be used.
    A special locale name exists: Specifying 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.
    To enforce special date calculation mode for Cyrillic calendars you should specify and where <local_name> can be ru_RU.KOI8-R, uk_UA.KOI8-U or by_BY.KOI8-B.
    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. (may be followed by a positive or negative integer) is Easter for this year. (may be followed by a positive or negative integer) is Orthodox Easter for this year. Weekdays may be followed by (aliases last, first, second, third, fourth) for moving events like
    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
    and finally in
    Empty lines and lines protected by the C commenting syntax
    are ignored.
    Some possible calendar entries (<tab> characters are highlighted by a \t sequence):
    #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
    Ostern-2\tGood Friday (2	days before Easter)
    Paskha\tOrthodox	Easter


    • calendar file to read calendar data from
    • ~/.calendar directory in the user's home directory (which changes into if
    does not exist in the current directory)
  • ~/.calendar/calendar file to use if no calendar file exists in the current directory
  • ~/.calendar/nomail will not send mail if this file exists
  • calendar.birthday births and deaths of famous (and not-so-famous) people
  • 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.fictional Fantasy and Fiction dates (mostly LOTR)
  • calendar.history everything else, mostly U.S. historical events
  • calendar.holiday other holidays (including the not-well-known, obscure, and 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.openbsd related events
  • calendar.pagan Pagan holidays, celebrations and festivals
  • calendar.usholiday U.S. holidays
  • calendar.world World wide calendar
  • calendar.croatian Croatian calendar
  • calendar.german German calendar
  • calendar.russian Russian calendar

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


    The 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.


    The 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 flag argument syntax is from the original FreeBSD program.
    The and flags are Debian-specific enhancements. Also, the original program did not accept as an argument to the flag.
    Using as a locale name is a Debian-specific enhancement.


    A command appeared in


    doesn't handle Jewish holidays or moon phases. The and flags do the same thing.