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CALENDAR(1)            DragonFly General Commands Manual           CALENDAR(1)


calendar - reminder service


calendar [-A num] [-a] [-B num] [-d] [-F friday] [-f calendar_file] [-H calendar_home] [-h] [-L latitude,longitude[,elevation]] [-s category] [-T hh:mm[:ss]] [-t [[[CC]YY]MM]DD] [-U +-hh[[:]mm]] [-W num]


The calendar utility processes calendar files and displays lines that fall into the specified date range. On the day before a weekend (normally Friday), events for the next three days are displayed. The following options are available: -A num Print lines from today and the next num days (forward, future). -a Process the calendar files (~/.calendar/calendar) of all users and mail the results to them. This requires super-user privileges. -B num Print lines from today and the previous num days (backward, past). -d Print debug messages. This flag may be repeated multiple times to increase the verbosity. -F friday Specify which day of the week is "Friday" (the day before the weekend begins). The default is 5. -f calendar_file Use calendar_file as the default calendar file. If specified as -, then read from standard input. Note that this flag cannot be used together with the -a flag. -H calendar_home Use calendar_home as the calendar home directory. Note that this flag cannot be used together with the -a flag. -h Show the utility usage. -L latitude,longitude[,elevation] Specify the location for use in some calculations, such as the current Sun and Moon positions and their rise and set times. The latitude and longitude arguments are given in units of degrees, which can be a decimal number or in the DMS format of "[+-]d:m:s". The elevation argument is optional and is given in units of meters. If not specified, the latitude and elevation arguments are default to 0, while the longitude argument is calculated from the adopted UTC offset (i.e., 15 degrees times the UTC offset in hours). -s category Show information of the specified category, which can take the following values: chinese Show the Chinese calendar and the 24 solar terms (a.k.a. Jieqi) in this year. julian Show the Julian calendar. moon Show Moon position, phases, rise and set times, and lunar events in this year. sun Show Sun position, rise and set times, and solar events in this year. -T hh:mm[:ss] Specify the time of day to use instead of the current system time. This time is only used in determining the Sun and Moon information. -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. -U +-hh[[:]mm] Specify the timezone with a UTC offset. If not specified, the timezone of localtime is used. -W num Print lines from today and the next num days (forward, future). Similar to the -A option but ignore weekends when calculating the number of days.


The calendar files are preprocessed by a limited subset of cpp(1) internally, allowing the inclusion of shared calendar files. This limited directive subset consists of #include, #ifndef, #endif, and #define. If the calendar file to be included (via the #include directive) is not referenced by a full pathname, calendar searches in its home directory (~/.calendar or specified by the -H flag) first, then in the /etc/calendar directory, and finally in the /usr/share/calendar directory. Both the C-style comment (/* ... */) and C++-style comment (// ...) are supported. The default calendar used by the calendar utility is the "Gregorian calendar". In addition, the following calendars are supported: Julian The Julian calendar Chinese The Chinese calendar Specify "CALENDAR=<calendar>" in the calendar file to select the calendar to use. The calendar will be reset to the default Gregorian calendar at the end of the calendar file. When a non-default calendar is selected, the matched events will be printed with a secondary date formatted in the selected calendar. To handle calendars in national code table, specify "LANG=<locale>" in the calendar file, before the national names being used. This setting will also make the event date in this calendar file be formatted in national names in the output. The locale change will be reset at the end of the calendar file. To handle the local name of sequences, specify them as "SEQUENCE=<first> <second> <third> <fourth> <fifth> <last>" in the calendar file. The names of the following special days are recognized: Easter Catholic Easter. Paskha Orthodox Easter. Advent First Sunday of Advent. NewMoon The lunar New Moon. FullMoon The lunar Full Moon. MarEquinox The solar equinox in March. JunSolstice The solar solstice in June. SepEquinox The solar equinox in September. DecSolstice The solar solstice in December. ChineseNewYear The first day of the Chinese year. ChineseQingming The Chinese Qingming festival (a.k.a. Tomb- Sweeping Day). ChineseJieqi The 24 solar terms (Jieqi) in Chinese calendar. These names may be reassigned to their local names via an assignment like "<name>=<local_name>" in the calendar file, and then the "<local_name>" can also be used to specify the date. Other lines should begin with a year (optional), month and day. They may be entered in multiple formats, either numeric or as character strings. If the proper locale is set (via "LANG=<locale>"), national month and weekday names can be used as well. Additional rules are as follows: * Two numbers default to the month followed by the day. * A single asterisk (`*') matches every month. * A day without a month matches that day of every week. * A day of zero means the last day of previous month. * The names of special days may be followed by a positive or negative integer to represent the date offset, like: "Easter+3" or "Paskha-4". * A weekday may be followed by a sequence name ("First" ... "Fifth", and "Last") to specify moving events, like "the last Monday in April". Numeric sequence ("+-[12345]") can also be used. * A date may be followed by an asterisk (`*') to indicate that it is not fixed (i.e., changes from year to year). * A date must be immediately followed by <tab> character(s), and then followed by the event description. Lines without containing a <tab> character are invalid and thus ignored. * Lines starting with a <tab> character are treated as a continuation of the previous line, allowing multiple-line description of an event. The supported date styles can vary with calendars. In the Gregorian calendar, the following date styles are supported: Date ::= Year . '/' . Month . '/' . DayOfMonth | Year . ' ' . Month . ' ' . DayOfMonth | Month . '/' . DayOfMonth | Month . ' ' . DayOfMonth | Month . '/' . DayOfWeek . Index | Month . ' ' . DayOfWeek . Index | MonthName . '/' . AllDays | MonthName . ' ' . AllDays | AllDays . '/' . MonthName | AllDays . ' ' . MonthName | AllMonths . '/' . DayOfMonth | AllMonths . ' ' . DayOfMonth | DayOfMonth . '/' . AllMonths | DayOfMonth . ' ' . AllMonths | DayOfMonth . '/' . Month | DayOfMonth . ' ' . Month | DayOfWeek . Index . '/' . MonthName | DayOfWeek . Index . ' ' . MonthName | DayOfWeek . Index SpecialDay . Offset Year ::= '0' ... '9' | '00' ... '09' | '10' ... '99' | '100' ... '999' | '1000' ... '9999' Month ::= MonthName | MonthNumber MonthNumber ::= '0' ... '9' | '00' ... '09' | '10' ... '12' MonthName ::= MonthNameShort | MonthNameLong MonthNameLong ::= 'January' ... 'December' MonthNameShort ::= 'Jan' ... 'Dec' | 'Jan.' ... 'Dec.' DayOfWeek ::= DayOfWeekShort | DayOfWeekLong DayOfWeekShort ::= 'Mon' ... 'Sun' DayOfWeekLong ::= 'Monday' ... 'Sunday' DayOfMonth ::= '0' ... '9' | '00' ... '09' | '10' ... '29' | '30' ... '31' AllMonths ::= '*' AllDays ::= '*' Index ::= '' | IndexName | '+' . IndexNumber | '-' . IndexNumber IndexName ::= 'First' | 'Second' | 'Third' | 'Fourth' | 'Fifth' | 'Last' IndexNumber ::= '1' ... '5' Offset ::= '' | '+' . OffsetNumber | '-' . OffsetNumber OffsetNumber ::= '0' ... '9' | '00' ... '99' | '000' ... '299' | '300' ... '359' | '360' ... '365' SpecialDay ::= 'Easter' | 'Paskha' | 'Advent' | 'ChineseNewYear' | 'ChineseQingming' | 'ChineseJieqi' | 'NewMoon' | 'FullMoon' | 'MarEquinox' | 'SepEquinox' | 'JunSolstice' | 'DecSolstice'


Some possible calendar entries (<tab> characters highlighted as `\t'): CLANEDAR=Gregorian LANG=C Easter=Ostern /* Include shared calendar files */ #include <calendar.birthday> #include <calendar.holiday> 6/15\tJune 15 (if ambiguous, will default to month/day) Jun. 15\tJune 15 15 June\tJune 15 15 *\t15th of every month 0 *\tLast day of every month March/0\tLast day of February 2010/4/15\t15 April 2010 2020/11/03*\tU.S. Election Day ('*' indicates a movable event) Thursday\tEvery Thursday SatSecond\tSecond Saturday of every month Apr/Mon\tEvery Monday in April May Sun+2\tSecond Sunday in May (Muttertag) 04/SunLast\tLast Sunday in April, \tSummer time in Europe // continuation of previous line Easter\tEaster Ostern-2\tGood Friday (2 days before Easter) Paskha\tOrthodox Easter NewMoon\tNew moon of every month


calendar The calendar file to find in current directory. ~/.calendar The default calendar home directory. A chdir(2) is done into this directory if it exists. ~/.calendar/calendar The calendar file to use if no calendar file exists in the current directory. ~/.calendar/nomail Do not send mail if this file exists. /etc/calendar/default The system-wide default calendar file, which is used if the ~/.calendar/calendar doesn't exist. This fallback calendar file is ignored in the -a mode. The following calendar files are provided in /usr/share/calendar: calendar.all File which includes all the calendar files. calendar.australia Calendar of events in Australia. calendar.birthday Births and deaths of famous (and not-so-famous) people. calendar.brazilian Calendar of events in Brazil. calendar.canada Canadian holidays. calendar.chinese Calendar of events in China. calendar.christian Christian holidays. calendar.computer Days of special significance to computer people. calendar.croatian Calendar of events in Croatia. calendar.discord Discordian calendar (all rites reversed). calendar.dragonfly DragonFly related events. calendar.dutch Calendar of events in the Netherlands. calendar.fictional Fantasy and fiction dates (mostly Load Of The Rings). calendar.french Calendar of events in France. calendar.german Calendar of events in Germany. calendar.history Miscellaneous history. calendar.holiday Other holidays, including the not-well-known, obscure, and really obscure. calendar.hungarian Calendar of events in Hungary. calendar.judaic Jewish holidays. This calendar should be updated yearly by the local system administrator so that roving holidays are set correctly for the current year. The entries for this calendar have been obtained from the port deskutils/hebcal. calendar.misc Miscellaneous events. calendar.music Musical events, births, and deaths. Strongly oriented toward rock 'n' roll and classical. calendar.newzealand Calendar of events in New Zealand. calendar.orthodox Orthodox holidays. calendar.russian Russian calendar. calendar.southafrica Calendar of events in South Africa. calendar.space Aerospace and astronomical events. calendar.uk Calendar of events in U.K. calendar.ukrainian Calendar of events in Ukraine. calendar.ushistory U.S. history. calendar.usholiday U.S. holidays. This calendar should be updated yearly by the local system administrator so that roving holidays are set correctly for the current year. calendar.world Includes all calendar files except for national ones.


The calendar utility 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.


at(1), cal(1), mail(1), cron(8) Edward M. Reingold and Nachum Dershowitz, Calendrical Calculations: The Ultimate Edition (4th Edition), Cambridge University Press, 2018, ISBN: 9781107057623.


A calendar command appeared in Version 7 AT&T UNIX. The calendar utility was significantly enhanced in FreeBSD 9.0 by Edwin Groothuis <edwin@FreeBSD.org>, and was later rewritten to support multiple calendars in DragonFly 5.9 by Aaron LI <aly@aaronly.me>.


The new and full moons are happening on the day indicated. They can happen in the time period from the early morning to the late evening. The adopted methods to calculate solar and lunar events are simplified astronomical algorithms, so the accuracy of events is within several minutes, provided that the precise location is specified. Druids and Werewolves should double-check the start and end time of solar and lunar events.


The calendar internal preprocessor only recognizes #include, #ifndef, #endif, and #define. Quoted or escaped comment marks are not supported yet. An event can repeat at most 100 times in the specified date range. The most repeated event is an weekly event, so a maximum of 100 repeats covers a date range of about 2 years. If more repeats of events are needed, you're likely using calendar in the wrong way ;) DragonFly 5.9-DEVELOPMENT September 14, 2020 DragonFly 5.9-DEVELOPMENT

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