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Date::Calendar::Profiles(3)    User Contributed Perl Documentation    Date::Calendar::Profiles(3)

NAME
       Date::Calendar::Profiles - Some sample profiles for Date::Calendar and
       Date::Calendar::Year

SYNOPSIS
	 use Date::Calendar::Profiles qw( $Profiles );
	 use Date::Calendar;

	 $cal_US_AK = Date::Calendar->new( $Profiles->{'US-AK'} [,LANG[,WEEKEND]] );
	 $cal_DE_BY = Date::Calendar->new( $Profiles->{'DE-BY'} [,LANG[,WEEKEND]] );

	or

	 use Date::Calendar::Profiles qw( $Profiles );
	 use Date::Calendar::Year;

	 $year_2000_US_FL = Date::Calendar::Year->new( 2000, $Profiles->{'US-FL'} [,LANG[,WEEKEND]] );
	 $year_2001_DE_NW = Date::Calendar::Year->new( 2001, $Profiles->{'DE-NW'} [,LANG[,WEEKEND]] );

	and also

	 use Date::Calendar::Profiles
	 qw(
	     &Previous_Friday
	     &Next_Monday
	     &Next_Monday_or_Tuesday
	     &Nearest_Workday
	     &Sunday_to_Monday
	     &Advent1
	     &Advent2
	     &Advent3
	     &Advent4
	     &Advent
	 );

PREFACE
       This module provides some sample profiles (i.e., holiday schemes) for use with the
       Date::Calendar(3) and Date::Calendar::Year(3) module.

       You are not required to use these, you can always roll your own (this is very easy). See
       the section "HOW TO ROLL YOUR OWN" below for more instructions on how to do this, and take
       the profiles from this module as examples.

       Please let me know of any errors in these profiles, and please send me your own profiles
       if you'd like to see them included in the next release of this module! Thank you!

       (But please, only use the ISO-Latin-1 character set whenever possible, since my module
       doesn't support any other character sets yet, or at least tell me which character set you
       used so I can document this in this manual page. Thank you!)

DESCRIPTION
       The method "init()" in module Date::Calendar::Year(3) is responsible for parsing the
       calendar schemes contained here in the Date::Calendar::Profiles module.

       This method offers a "mini-language" which allows to specify common date formulas, like
       for instance a simple fixed date (in various different formats, e.g. american or
       european), or things like "the second Sunday of May" (Mother's Day), or "Easter Sunday
       minus 46 days" (Ash Wednesday), to cite just a few.

       See the section "DATE FORMULA SYNTAX" below for more details.

       There are some more complicated formulas, however, which cannot be expressed in such
       simple terms.

       The rule that if a holiday falls on a weekend, it will be substituted by either the
       adjacent Friday or Monday (whichever lies closer), is an example of this.

       In order to be able to deal with such formulas, and in order to be as flexible as
       possible, the "init()" method offers the possibility of using callback functions to deal
       with such dates and formulas.

       See the section "CALLBACK INTERFACE" below for more details on this topic.

       In order to assist you with more common cases of odd formulas, the module
       Date::Calendar::Profiles exports the following utility subroutines (which are meant to be
       used as "filters" in callback functions of your own):

       o "($year,$month,$day[,ANYTHING]) = Previous_Friday($year,$month,$day[,ANYTHING]);"

	 If the given date falls on a Saturday or Sunday, this function changes the date to the
	 adjacent Friday before that, and returns this new date.

	 Otherwise the given date is returned unchanged.

	 The rest of the input parameters, if any, are simply copied to the output.

       o "($year,$month,$day[,ANYTHING]) = Next_Monday($year,$month,$day[,ANYTHING]);"

	 If the given date falls on a Saturday or Sunday, this function changes the date to the
	 adjacent Monday after that, and returns this new date.

	 Otherwise the given date is returned unchanged.

	 The rest of the input parameters, if any, are simply copied to the output.

       o "($year,$month,$day[,ANYTHING]) = Next_Monday_or_Tuesday($year,$month,$day[,ANYTHING]);"

	 If the given date falls on a Saturday, the date of the next Monday (after that weekend)
	 is returned.

	 If the given date falls on a Sunday, the date of the next Tuesday (after that weekend)
	 is returned.

	 If the given date falls on a Monday, the date of the next Tuesday (the day after the
	 Monday) is returned.

	 Otherwise the given date is returned unchanged.

	 The rest of the input parameters, if any, are simply copied to the output.

	 This function is used for the second of two adjacent holidays, where the first holiday
	 obeys the "Next Monday" rule (see the description of the function immediately above).

	 Examples of this are Christmas and Boxing Day, among others.

	 When the first holiday falls on Friday, the second one falls on Saturday and is
	 substituted by Monday.

	 When the first holiday falls on a Saturday, the second one falls on Sunday, so the first
	 holiday is substituted by Monday and the second one by Tuesday.

	 When the first holiday falls on a Sunday, the second one falls on a Monday. Therefore
	 the first holiday is substituted by Monday, and consequently the second holiday must be
	 substituted by Tuesday.

	 Or, in other terms:

	     Fri Sat => Fri Mon
	     Sat Sun => Mon Tue
	     Sun Mon => Mon Tue

	 Note that there is no filter subroutine yet for the second of two adjacent holidays when
	 the first holiday obeys the "Nearest Workday" rule (see the function described
	 immediately below), i.e.,

	     Fri Sat => Fri Mon
	     Sat Sun => Fri Mon
	     Sun Mon => Mon Tue

	 This is left as an excercise to the inclined reader. ":-)"

       o "($year,$month,$day[,ANYTHING]) = Nearest_Workday($year,$month,$day[,ANYTHING]);"

	 If the given date falls on a Saturday, this function returns the date of the Friday on
	 the day before.

	 If the given date falls on a Sunday, this function returns the date of the Monday on the
	 day after.

	 Otherwise the given date is returned unchanged.

	 The rest of the input parameters, if any, are simply copied to the output.

       o "($year,$month,$day[,ANYTHING]) = Sunday_to_Monday($year,$month,$day[,ANYTHING]);"

	 If the given date falls on a Sunday, this function returns the date of the Monday on the
	 day after.

	 Otherwise the given date is returned unchanged.

	 The rest of the input parameters, if any, are simply copied to the output.

       The typical use of these filter subroutines is in a "return" statement at the end of
       callback functions of your own, when you already have calculated the holiday in question
       and only need to adjust it according to the rule implemented by the filter subroutine in
       question.

       See also the implementation of the Date::Calendar::Profiles module for examples of how to
       use these functions.

DATE FORMULA SYNTAX
	-  Fixed dates:

	   "Christmas"	=>  "24.12",   # European format (day, month)
	   "Christmas"	=>  "24.12.",

	   "Christmas"	=>  "24Dec",
	   "Christmas"	=>  "24.Dec",
	   "Christmas"	=>  "24Dec.",
	   "Christmas"	=>  "24.Dec.",

	   "Christmas"	=>  "24-12",
	   "Christmas"	=>  "24-12-",

	   "Christmas"	=>  "24-Dec",
	   "Christmas"	=>  "24-Dec-",

	   "Christmas"	=>  "12/25",   # American format (month, day)
	   "Christmas"	=>  "Dec25",
	   "Christmas"	=>  "Dec/25",

	-  Dates relative to Easter Sunday:

	   "Ladies' Carnival"  =>  "-52",
	   "Carnival Monday"   =>  "-48",
	   "Mardi Gras"        =>  "-47",
	   "Ash Wednesday"     =>  "-46",
	   "Palm Sunday"       =>   "-7",
	   "Maundy Thursday"   =>   "-3",
	   "Good Friday"       =>   "-2",
	   "Easter Sunday"     =>   "+0",
	   "Easter Monday"     =>   "+1",
	   "Ascension"	       =>  "+39",
	   "Whitsunday"        =>  "+49",
	   "Whitmonday"        =>  "+50",
	   "Corpus Christi"    =>  "+60",

	-  The 1st, 2nd, 3rd, 4th or last day of week:

	   "Thanksgiving"      =>  "4Thu11",
	   "Thanksgiving"      =>  "4/Thu/Nov",
	   "Columbus Day"      =>  "2/Mon/Oct",
	   "Columbus Day"      =>  "2/Mon/10",
	   "Columbus Day"      =>  "2/1/Oct",
	   "Columbus Day"      =>  "2/1/10",
	   "Memorial Day"      =>  "5/Mon/May", # LAST Monday of May

	-  Half holidays, commemorative days:

	   "Christmas"	       =>  ":24.12.", # only half a day off
	   "Valentine's Day"   =>  "#Feb/14", # not an official holiday

CALLBACK INTERFACE
       The interface of the callback functions to use with the "init()" method of the
       Date::Calendar::Year(3) module is very simple:

       The callback function receives two arguments when called, first the year number for which
       the holiday is to be calculated, and second the name (the "label") of the holiday in
       question (which serves as key in the hash of a holiday scheme).

       This second parameter allows you to use the same callback function for different holidays,
       which might be more practical (than separate callback functions) if for instance you have
       a set of similar holidays to calculate, like for instance the four Sundays before
       Christmas ("Advent").

       The callback function "Advent()" (exported by the Date::Calendar::Profiles module)
       exemplifies this technique.

       The callback function is expected to return a list ""($year,$month,$day)"" with the exact
       date of the holiday (the year number in the output must of course match the year number
       passed as parameter).

       A fatal error occurs if the returned list does not constitute a valid date, in the
       requested year.

       Optionally, the callback function may return a fourth value (after the date) containing a
       string, which may be either "#" or ":".

       The string "#" signifies that the date in question is a purely commemorative date, i.e.,
       that you don't get a day off from work on that day.

       The string ":" means that the date in question is a "half" holiday, i.e., a day on which
       you get half a day off from work.

       In case the holiday in question was not observed or did not exist in the requested year,
       the callback function may also return an empty list. This will cause the "init()" method
       to simply drop this holiday for that year.

       The module Date::Calendar::Profiles exports the sample callback functions "Advent1()",
       "Advent2()", "Advent3()", "Advent4()" and "Advent()", which might assist you in rolling
       your own profiles.

HOW TO ROLL YOUR OWN
       Every calendar profile (holiday scheme) is a hash.

       The name of the holiday (like "Christmas", for instance) serves as the key in this hash
       and must therefore be unique (unless you want to override a default which was set
       previously, but see below for more on this).

       The value for each key is either a string, which specifies a simple date formula, or the
       reference of a callback function.

       See the section "CALLBACK INTERFACE" above for a description of the interface (in and out)
       of these callback functions.

       See the section "DATE FORMULA SYNTAX" above and the description of the "init()" method in
       Date::Calendar::Year(3) for the exact syntax of date formula strings.

       BEWARE that if keys are not unique in the source code, later entries will overwrite
       previous ones! I.e.,

	   ...
	   "My special holiday" => "01-11",
	   "My special holiday" => "02-11",
	   ...

       will NOT set two holidays of the same name, one on November first, the other on November
       second, but only one, on November second!

       Therefore, in order to use sets of defaults and to be able to override some of them, you
       must FIRST include any hash containing the default definitions, and THEN write down your
       own definitions (see also the Date::Calendar::Profiles module for examples of this!), like
       this:

	   $defaults =
	   {
	       "Holiday #1" => "01-01",
	       "Holiday #2" => "02-02",
	       "Holiday #3" => "03-03"
	   };

	   $variant1 =
	   {
	       %$defaults,
	       "Holiday #2" => "09-02",
	       "Holiday #4" => "04-04"
	   };

       This is because of the way hashes work in Perl.

       Now let's suppose that you want to write a profile containing all your relatives' and
       friends' birthdays or anniversaries.

       Simply go ahead and list them in your program, in any order you like, as follows (for
       example):

	 $Birthdays =
	 {
	     "Spouse 1971"	       =>  "30.12.",
	     "Wedding Day 1992"        =>  "01.09.",
	     "Valentine's Day"	       =>  "14.02.",
	     "Son Richard 1996"        =>  "11.05.",
	     "Daughter Irene 1994"     =>  "17.01.",
	     "Mom 1939" 	       =>  "19.08.",
	     "Dad 1937" 	       =>  "23.04.",
	     "Brother Timothy 1969"    =>  "24.04.",
	     "Sister Catherine 1973"   =>  "21.10.",
	     "Cousin Paul 1970"        =>  "16.10.",
	     "Aunt Marjorie 1944"      =>  "09.06.",
	     "Uncle George 1941"       =>  "02.08.",
	     "Friend Alexander 1968"   =>  "12.06.",
	 };

       The year numbers after the names are not really necessary, but they allow us to display
       the person's current age. If this year number is omitted, we simply don't display the age.

       Now in order to query this birthday database, we can use the following little program:

	 #!perl -w

	 use strict;
	 no strict "vars";
	 use Date::Calc qw(:all);
	 use Date::Calendar;

	 $Birthdays =
	 {
	     ... # (see above)
	 };

	 @today = Today();
	 $calendar = Date::Calendar->new( $Birthdays );
	 $calendar->year( $today[0] );

	 foreach $key (@ARGV)
	 {
	     if (@list = $calendar->search( $key ))
	     {
		 foreach $date (@list)
		 {
		     @labels = $calendar->labels( $date );
		     $dow = shift(@labels);
		     # More than one person might have birthday on the same date:
		     $name = $key;
		     foreach $person (@labels)
		     {
			 if (index(lc($person),lc($key)) >= 0)
			 {
			     $name = $person;
			     last;
			 }
		     }
		     $delta = Delta_Days(@today, $date->date());
		     $age = '';
		     if ($name =~ s!\s*(\d+)\s*$!!)
		     {
			 $age = $today[0] - $1;
			 $age-- if ($delta > 0);
			 $age = sprintf(" (%2d years old)", $age);
		     }
		     printf
		     (
			 "%-20.20s: %+5d days => %3.3s %2d-%3.3s-%4d%s\n",
			 $name,
			 $delta,
			 $dow,
			 $date->day(),
			 Month_to_Text($date->month()),
			 $date->year(),
			 $age
		     );
		 }
	     }
	     else { print "No entry found in birthday list for '$key'!\n" }
	 }

	 __END__

       Let us save this program as, say, "birthday.pl".

       Then we can query this birthday database by providing search strings on the command line,
       like this (note that this is a (case-insensitive) substring search, NOT a regular
       expression match!):

	 > date
	 Wed Oct  3 18:05:45 CEST 2001

	 > perl birthday.pl wed spo
	 Wedding Day	     :	 -32 days => Sat  1-Sep-2001 ( 9 years old)
	 Spouse 	     :	 +88 days => Sun 30-Dec-2001 (29 years old)

	 > perl birthday.pl son daug
	 Son Richard	     :	-145 days => Fri 11-May-2001 ( 5 years old)
	 Daughter Irene      :	-259 days => Wed 17-Jan-2001 ( 7 years old)

	 > perl birthday.pl broth sist
	 Brother Timothy     :	-162 days => Tue 24-Apr-2001 (32 years old)
	 Sister Catherine    :	 +18 days => Sun 21-Oct-2001 (27 years old)

	 > perl birthday.pl mom dad
	 Mom		     :	 -45 days => Sun 19-Aug-2001 (62 years old)
	 Dad		     :	-163 days => Mon 23-Apr-2001 (64 years old)

	 > perl birthday.pl uncl aunt
	 Uncle George	     :	 -62 days => Thu  2-Aug-2001 (60 years old)
	 Aunt Marjorie	     :	-116 days => Sat  9-Jun-2001 (57 years old)

	 > perl birthday.pl alex
	 Friend Alexander    :	-113 days => Tue 12-Jun-2001 (33 years old)

       In order to get the whole list, we can supply a substring which is contained in every
       name, which happens to be a blank (" "):

	 > perl birthday.pl ' '
	 Daughter Irene      :	-259 days => Wed 17-Jan-2001 ( 7 years old)
	 Valentine's Day     :	-231 days => Wed 14-Feb-2001
	 Dad		     :	-163 days => Mon 23-Apr-2001 (64 years old)
	 Brother Timothy     :	-162 days => Tue 24-Apr-2001 (32 years old)
	 Son Richard	     :	-145 days => Fri 11-May-2001 ( 5 years old)
	 Aunt Marjorie	     :	-116 days => Sat  9-Jun-2001 (57 years old)
	 Friend Alexander    :	-113 days => Tue 12-Jun-2001 (33 years old)
	 Uncle George	     :	 -62 days => Thu  2-Aug-2001 (60 years old)
	 Mom		     :	 -45 days => Sun 19-Aug-2001 (62 years old)
	 Wedding Day	     :	 -32 days => Sat  1-Sep-2001 ( 9 years old)
	 Cousin Paul	     :	 +13 days => Tue 16-Oct-2001 (30 years old)
	 Sister Catherine    :	 +18 days => Sun 21-Oct-2001 (27 years old)
	 Spouse 	     :	 +88 days => Sun 30-Dec-2001 (29 years old)

       By the way, a similar program is included in the "examples" subdirectory of the Date::Calc
       distribution, called "anniversaries.pl".

       See also the file "EXAMPLES.txt" in the distribution's main directory for a short
       description of that little script.

SEE ALSO
       Date::Calendar(3), Date::Calendar::Year(3), Date::Calc::Object(3), Date::Calc(3),
       Date::Calc::Util(3).

LIMITATIONS
       The calendar profiles included in this module usually do not take historical
       irregularities into account (even though some do in order to show how this can be done),
       they only provide means for calculating regularly recurring events (the profiles should
       therefore not be relied upon for historical faithfulness).

KNOWN BUGS
       The australian calendar profiles are known to contain wrong dates.  This is due to the
       fact that Australia decrees its holidays individually for each year, difficulting the
       calculation of the holidays by way of a formula. An effort to compare (and to correct) the
       current implementation with official documents (web pages) by the Australian authorities
       is under way. This hasn't been finished yet because it is very time-consuming.

VERSION
       This man page documents "Date::Calendar::Profiles" version 6.3.

AUTHOR
	 Steffen Beyer
	 mailto:STBEY@cpan.org
	 http://www.engelschall.com/u/sb/download/

COPYRIGHT
       Copyright (c) 2000 - 2009 by Steffen Beyer. All rights reserved.

LICENSE
       This package is free software; you can use, modify and redistribute it under the same
       terms as Perl itself, i.e., at your option, under the terms either of the "Artistic
       License" or the "GNU General Public License".

       The C library at the core of the module "Date::Calc::XS" can, at your discretion, also be
       used, modified and redistributed under the terms of the "GNU Library General Public
       License".

       Please refer to the files "Artistic.txt", "GNU_GPL.txt" and "GNU_LGPL.txt" in the
       "license" subdirectory of this distribution for any details!

DISCLAIMER
       This package is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

       See the "GNU General Public License" for more details.

perl v5.16.3				    2009-10-31		      Date::Calendar::Profiles(3)
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