Date::Calendar::ProfilUser)Contributed Perl DocumenDate::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.
I intend not to make any fixes to any of the calendar profiles in this
module anymore unless there are VERY compelling reasons to do so. These
profiles are merely meant as examples.
The suggested way of using these profiles is to copy them to your own
code and then to modify them as needed. Otherwise many people could be
negatively affected if I made any changes to a profile someone has been
using for years.
Any improvements are therefore left as an exercise to the inclined
reader.
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 6.4.
AUTHOR
Steffen Beyer
mailto:STBEY AT cpan.org
http://www.engelschall.com/u/sb/download/
COPYRIGHT
Copyright (c) 2000 - 2015 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.
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