Date::Calendar::Year(3User Contributed Perl DocumentatiDate::Calendar::Year(3)
NAME
Date::Calendar::Year - Implements embedded "year" objects for
Date::Calendar
MOTTO
There is more than one way to do it - this is just one of them!
PREFACE
Note that Date::Calendar::Year (and Date::Calendar) can only deal with
years lying within the range [1583..2299].
SYNOPSIS
use Date::Calendar::Year qw( check_year empty_period );
use Date::Calendar::Year qw( :all ); # same as above
check_year(YEAR|DATE); # dies if year < 1583 or year > 2299
empty_period(); # warns about empty interval if $^W is set
$index = $year->date2index(YEAR,MONTH,DAY|DATE);
$date = $year->index2date(INDEX);
use Date::Calendar::Profiles qw( $Profiles );
$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]] );
$year = Date::Calendar::Year->new( 2001, {} );
$year->init( 2002, $Profiles->{'DE-SN'} [,LANG[,WEEKEND]] );
$vector = $year->vec_full(); # vector of full holidays
$vector = $year->vec_half(); # vector of half holidays
$vector = $year->vec_work(); # NOT a vector of workdays but a workspace!
$size = $year->val_days(); # number of days in that year, size of vectors
$base = $year->val_base(); # number of days for [year,1,1] since [1,1,1]
$number = $year->val_year(); # the year's number itself
$number = $year->year(); # alias for val_year()
@names = $year->labels(YEAR,MONTH,DAY|DATE);
@holidays = $year->labels();
$holidays = $year->labels();
@dates = $year->search(PATTERN);
$dates = $year->search(PATTERN);
$hashref = $year->tags(YEAR,MONTH,DAY|DATE);
$hashref = $year->tags(INDEX);
$days = $year->delta_workdays(YEAR,MONTH1,DAY1|DATE1
,YEAR,MONTH2,DAY2|DATE2
,FLAG1,FLAG2);
($date,$rest,$sign) = $year->add_delta_workdays(YEAR,MONTH,DAY|DATE
,DELTA,SIGN);
$flag = $year->is_full(YEAR,MONTH,DAY|DATE);
$flag = $year->is_half(YEAR,MONTH,DAY|DATE);
$flag = $year->is_work(YEAR,MONTH,DAY|DATE);
INTERFACE
Note that whenever a year number, a date, a time or a combined date and
time are expected as input parameters by one of the methods of this
class, you can always pass a Date::Calc[::Object] date object or an
array reference (of an array of appropriate length) instead!
See Date::Calc::Object(3) for more details.
So instead of calling a given method like this:
$object->method1( $year,$month,$day );
$object->method2( $year1,$month1,$day1, $year2,$month2,$day2 );
$object->method3( $year1, $year2, $year3 );
You can also call it like so:
$object->method1( $date );
$object->method1( [1964,1,3] );
$object->method2( $year1,$month1,$day1, $date2 );
$object->method2( $date1, $year2,$month2,$day2 );
$object->method2( $date1, $date2 );
$object->method2( $year1,$month1,$day1, [2001,3,17] );
$object->method2( [1964,1,3], $year2,$month2,$day2 );
$object->method2( [1964,1,3], [2001,3,17] );
$object->method2( $date1, [2001,3,17] );
$object->method2( [1964,1,3], $date2 );
$object->method3( $year1, $date2, [2001,3,17] );
And similarly if a time or a combined date and time are expected.
If you substitute an expected year number by an anonymous array (this
is the recommended way of writing date constants, for increased
readability of your programs), it must contain three values,
nevertheless (otherwise the use of an anonymous array would be
pointless).
Don't confuse year numbers and their substitutes (a date object or an
array reference) with Date::Calendar::Year objects, which are a totally
different thing!
But incidentally ":-)", you may also pass a Date::Calendar::Year object
whenever a year number is expected. However, and perhaps against your
expectations at times, only the year number from that object will be
used, not the year object itself (the year object in question might be
using the wrong profile!).
Moreover, whenever a method of this class returns a date, it does so by
returning a Date::Calc[::Object] date object.
IMPLEMENTATION
Each Date::Calendar::Year object consists mainly of three bit vectors,
plus some administrative attributes, all stored in a (blessed) hash.
All three bit vectors contain as many bits as there are days in the
corresponding year, i.e., either 365 or 366.
The first bit vector, called "FULL", contains set bits for Saturdays,
Sundays and all "full" legal holidays (i.e., days off, on which you
usually do not work).
The second bit vector, called "HALF", contains set bits for all "half"
holidays, i.e., holidays where you get only half a day off from work.
The third and last bit vector, called "WORK", is used as a workspace,
in which various calculations are performed throughout this module.
Its name does NOT come from "working days" (as you might think), but
from "workspace".
It only so happens that it is used to calculate the working days
sometimes, at some places in this module.
But you are free to use it yourself, for whatever calculation you would
like to carry out yourself.
The two other bit vectors, "FULL" and "HALF", should never be changed,
unless you know EXACTLY what you're doing!
DESCRIPTION
Functions
o "check_year(YEAR);"
This function checks that the given year lies in the permitted range
[1583..2299]. It returns nothing in case of success, and throws an
exception ("given year out of range [1583..2299]") otherwise.
o "empty_period();"
This function issues a warning (from the perspective of the caller of
a Date::* module) that the given range of dates is empty ("dates
interval is empty"), provided that warnings are enabled (i.e., "$^W"
is true).
This function is currently used by the method "delta_workdays()" in
this class, and by its equivalent from the Date::Calendar module.
It is called whenever the range of dates of which the difference in
working days is to be calculated is empty. This can happen for
instance if you specify two adjacent dates both of which are not to
be included in the difference.
Methods
o "$index = $year->date2index(YEAR,MONTH,DAY|DATE);"
This method converts a given date into the number of the day in that
year (this is sometimes also referred to as the "julian" date), i.e.,
a number between 0 (for January 1st) and the number of days in the
given year minus one, i.e., 364 or 365 (for December 31st).
You may need this in order to access the bit vectors returned by the
methods "vec_full()", "vec_half()" and "vec_work()".
Note that there are shorthand methods in this module called
"is_full()", "is_half()" and "is_work()", which serve to test
individual bits of the three bit vectors which are a part of each
Date::Calendar::Year object.
An exception ("given year != object's year") is thrown if the year
associated with the year object itself and the year from the given
date do not match.
An exception ("invalid date") is also thrown if the given arguments
do not constitute a valid date, or ("given year out of range
[1583..2299]") if the given year lies outside of the permitted range.
o "$date = $year->index2date(INDEX);"
This method converts an index (or "julian date") for the given year
back into a date.
An exception ("invalid index") is thrown if the given index is
outside of the permitted range for the given year, i.e., "[0..364]"
or "[0..365]".
Note that this method returns a Date::Calc OBJECT!
o "$year_2000_US_FL = Date::Calendar::Year->new( 2000,
$Profiles->{'US-FL'} [,LANG[,WEEKEND]] );"
"$year_2001_DE_NW = Date::Calendar::Year->new( 2001,
$Profiles->{'DE-NW'} [,LANG[,WEEKEND]] );"
"$year = Date::Calendar::Year->new( 2001, {} );"
This is the constructor method. Call it to create a new
Date::Calendar::Year object.
The first argument must be a year number in the range [1583..2299].
The second argument must be the reference of a hash, which usually
contains names of holidays and commemorative days as keys and strings
containing the date or formula for each holiday as values.
Reading this hash and initializing the object's internal data is
performed by an extra method, called "init()", which is called
internally by the constructor method, and which is described
immediately below, after this method.
In case you want to call the "init()" method yourself, explicitly,
after creating the object, you can pass an empty profile (e.g., just
an empty anonymous hash) to the "new()" method, in order to create an
empty object, and also to improve performance.
The third argument is optional, and must consist of the valid name or
number of a language as provided by the Date::Calc(3) module, if
given.
This argument determines which language shall be used when reading
the profile, since the profile may contain names of months and
weekdays in its formulas in that language.
The default is English if no value or no valid value is specified
(and if the global default has not been changed with "Language()").
After the third argument, a list of day numbers which will constitute
the "weekend" can optionally be specified, where 1=Monday, 2=Tuesday,
3=Wednesday, 4=Thursday, 5=Friday, 6=Saturday and 7=Sunday.
If no values are given, 6 and 7 (Saturday and Sunday) are
automatically taken as default.
If values outside of the range 1..7 are given, they will be ignored.
This can be used to switch off this feature and to have no regularly
recurring holidays at all when for instance a zero is given.
o "$year->init( 2002, $Profiles->{'DE-SN'} [,LANG[,WEEKEND]] );"
This method is called by the "new()" constructor method, internally,
and has the same arguments as the latter.
See immediately above for a description of these arguments.
Note that you can also call this method explicitly yourself, if
needed, and you can of course subclass the Date::Calendar::Year class
and override the "init()" method with a method of your own.
The holiday scheme or "profile" (i.e., the reference of a hash passed
as the second argument to this method) must obey the following
semantics and syntax:
The keys are the names of the holiday or commemorative day in
question. Keys must be unique (but see further below).
The difference between a holiday and a commemorative day is that you
(usually) get a day off on a holiday, whereas on a purely
commemorative day, you don't.
A commemorative day is just a date with a name, nothing more.
The values belonging to these keys can either be the code reference
of a callback function (see Date::Calendar::Profiles(3) for more
details and examples), or a string.
All other values cause a fatal error with program abortion.
The strings can specify three types of dates:
- fixed dates
(like New Year, or first of January),
- dates relative to Easter Sunday
(like Ascension = Easter Sunday + 39 days), and
- the 1st, 2nd, 3rd, 4th or last
of a given day of week in a given month
(like "the 4th Thursday of November", or Thanksgiving).
All other types of dates must be specified via callback functions.
Note that the "last" of a given day of week is written as the "5th",
because the last is always either the 5th or the 4th of the given day
of week. So the "init()" module first calculates the 5th of the
requested day of week, and if that doesn't exist, takes the 4th
instead.
There are also two modifier characters which may prefix the string
with the date formula, "#" and ":".
The character "#" (mnemonic: it's only a comment) signals that the
date in question is a purely commemorative day, i.e., it will not
enter into any date calculations, but can be queried with the
"labels()" and "search()" methods, and appears when printing a
calendar, for instance.
The character ":" (mnemonic: divided into two halves) specifies that
the date in question is only a "half" holiday, i.e., you only get
half a day off instead of a full day. Some companies have this sort
of thing. ":-)"
The exact syntax for the date formula strings is the following (by
example):
- 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
Remember that each of these date formula strings may also be prefixed
with either "#" or ":":
"Christmas" => ":24.12.", # only half a day off
"Valentine's Day" => "#Feb/14", # not an official holiday
Note that the name of the month or day of week may have any length
you like, it just must specify the intended month or day of week
unambiguously. So "D", "De", "Dec", "Dece", "Decem", "Decemb",
"Decembe" and "December" would all be valid, for example. Note also
that case is ignored.
When specifying day and month numbers, or offsets relative to Easter
Sunday, leading zeros are permitted (for nicely indented formatting,
for instance) but ignored.
Leading zeros are not permitted in front of the ordinal number [1..5]
or the number of the day of week [1..7] when specifying the nth day
of week in a month.
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.
The "init()" method proceeds as follows:
First it checks whether the given year number lies in the range
[1583..2299]. A fatal error occurs if not.
Then it determines the number of days in the requested year, and
stores it in the given Date::Calendar::Year object.
It then calls the Bit::Vector(3) module to allocate three bit vectors
with a number of bits equal to the number of days in the requested
year, and stores the three object references (of the bit vectors) in
the Date::Calendar::Year object.
(See also the description of the three methods "vec_full()",
"vec_half()" and "vec_full()" immediately below.)
It then sets the bits which correspond to Saturdays and Sundays (or
optionally to the days whose numbers have been specified as the
"weekend") in the "full holidays" bit vector.
At last, it iterates over the keys of the given holiday scheme (of
the hash referred to by the hash reference passed to the "init()"
method as the second argument), evaluates the formula (or calls the
given callback function), and sets the corresponding bit in the
"full" or "half" holidays bit vector if the calculated date is valid.
A fatal error occurs if the date formula cannot be parsed or if the
date returned by a formula or callback function is invalid (e.g.
30-Feb-2001 or the like) or lies outside the given year (e.g.
Easter+365).
Finally, the "init()" method makes sure that days marked as "full"
holidays do not appear as "half" holidays as well.
Then the "init()" method returns.
Note that when deciphering the date formulas, the "init()" method
uses the functions "Decode_Day_of_Week()" and "Decode_Month()" from
the Date::Calc(3) module, which are language-dependent.
Therefore the "init()" method allows you to pass it an optional third
argument, which must consist of the valid name or number of a
language as provided by the Date::Calc(3) module.
For the time of scanning the given holiday scheme, the "init()"
method will use the language that has been specified, or the global
setting from "Language()" if no or an invalid language parameter is
given.
The default is English if none is specified and if the global setting
has not been modified.
This means that you can provide the names of months and days of week
in your holiday profile in any of the languages supported by the
Date::Calc(3) module, provided you give the "init()" method a clue
(the third parameter) which language to expect.
o "$vector = $year->vec_full();"
This method returns a reference to the bit vector in the given year
object which contains all "full" holidays.
BEWARE that you should NEVER change the contents of this bit vector
unless you know EXACTLY what you're doing!
You should usually only read from this bit vector, or use it as an
operand in bit vector operations - but never as an lvalue.
o "$vector = $year->vec_half();"
This method returns a reference to the bit vector in the given year
object which contains all "half" holidays.
BEWARE that you should NEVER change the contents of this bit vector
unless you know EXACTLY what you're doing!
You should usually only read from this bit vector, or use it as an
operand in bit vector operations - but never as an lvalue.
o "$vector = $year->vec_work();"
This method returns a reference to the "workspace" bit vector in the
given year object.
Note that you cannot rely on the contents of this bit vector.
You have to set it up yourself before performing any calculations
with it.
Currently the contents of this bit vector are modified by the two
methods "delta_workdays()" and "add_delta_workdays()", in ways which
are hard to predict (depending on the calculations being performed).
The size of this bit vector can be determined through either ""$days
= $vector->Size();"" or ""$days = $year->val_days();"".
o "$size = $year->val_days();"
This method returns the number of days in the given year object,
i.e., either 365 or 366. This is also the size (number of bits) of
the three bit vectors contained in the given year object.
o "$base = $year->val_base();"
This method returns the value of the expression
""Date_to_Days($year->val_year(),1,1)"", or in other words, the
number of days between January 1st of the year 1 and January 1st of
the given year, plus one.
This value is used internally by the method "date2index()" in order
to calculate the "julian" date or day of the year for a given date.
The expression above is computed only once in method "init()" and
then stored in one of the year object's attributes, of which this
method just returns the value.
o "$number = $year->val_year();"
"$number = $year->year();"
These two methods are identical, the latter being a shortcut of the
former.
They return the number of the year for which a calendar has been
stored in the given year object.
The method name "val_year()" is used here in order to be consistent
with the other attribute accessor methods of this class, and the
method "year()" is necessary in order to be able to pass
Date::Calendar::Year objects as parameters instead of a year number
in the methods of the Date::Calendar and Date::Calendar::Year
modules.
o "@names = $year->labels(YEAR,MONTH,DAY|DATE);"
"@holidays = $year->labels();"
"$holidays = $year->labels();"
If any arguments are given, they are supposed to represent a date. In
that case, a list of all labels (= names of holidays) associated with
that date are returned. The first item returned is always the name of
the day of week for that date.
If no arguments are given, the list of all available labels in the
given year is returned. This list does NOT include any names of the
days of week (which would be pointless in this case).
In list context, the resulting list itself is returned. In scalar
context, the number of items in the resulting list is returned.
o "@dates = $year->search(PATTERN);"
"$dates = $year->search(PATTERN);"
This method searches through all the labels of the given year and
returns a list of date objects with all dates whose labels match the
given pattern.
Note that this is a simple, case-insensitive substring search, NOT a
full-fledged regular expression search!
The result is guaranteed to be sorted chronologically.
In scalar context, only the number of items in the resulting list is
returned, instead of the resulting list itself (as in list context).
o "$hashref = $year->tags(YEAR,MONTH,DAY|DATE);"
"$hashref = $year->tags(INDEX);"
This method returns a hash reference for the given calendar and date
(or index). The hash it refers to is a copy of the calendar profile's
internal hash which contains the names for the given date as keys and
0, 1, 2, or 3 as their corresponding values meaning the following:
0 => commemorative day
1 => "half" holiday
2 => "full" holiday
3 => both a "half" and a "full" holiday
The value "3" should only occur if a date has been redefined by the
underlying profile using the same key (i.e., the same name) but with
a different type of holiday.
The index must be a number such as returned by the method
"date2index()"; it can be used here instead of a date or a date
object in order to speed up processing (= no need to calculate it
internally).
o "$days = $year->delta_workdays(YEAR,MONTH1,DAY1, YEAR,MONTH2,DAY2,
FLAG1,FLAG2);"
"$days = $year->delta_workdays(DATE1,DATE2,FLAG1,FLAG2);"
This method calculates the number of work days (i.e., the number of
days, but excluding all holidays) between two dates.
In other words, this method is equivalent to the "Delta_Days()"
function of the Date::Calc module, except that it disregards holidays
in its counting.
The two flags indicate whether the start and end dates should be
included in the counting (that is, of course, only in case they
aren't holidays), or not.
It is common, for example, that you want to know how many work days
are left between the current date and a given deadline.
Typically, you will want to count the current date but not the
deadline's date. So you would specify "true" ("1") for FLAG1 and
"false" ("0") for FLAG2 in order to achieve that.
In other words, a value of "true" means "including this date", a
value of "false" means "excluding this date".
As with the "Delta_Days()" function from the Date::Calc module, the
dates have to be given in chronological order to yield a positive
result. If the dates are reversed, the result will be negative.
The parameter FLAG1 is associated with the first given date, the
parameter FLAG2 with the second given date (regardless of whether the
dates are in chronological order or not).
An exception ("given year != object's year") is thrown if the year
number of either of the two given dates does not match the year
number associated with the given year object.
An exception ("invalid date") is also raised if either of the two
date arguments does not constitute a valid date.
o "($date,$rest,$sign) = $year->add_delta_workdays(YEAR,MONTH,DAY,
DELTA, SIGN);"
"($date,$rest,$sign) = $year->add_delta_workdays(DATE,DELTA,SIGN);"
This method is the equivalent of the "Add_Delta_Days()" function from
the Date::Calc module, except that it adds work days and skips
holidays.
In other words, you can add or subtract a number of work days "DELTA"
to/from a given date and get a new date as the result (as a
Date::Calc object).
You add days (i.e., you go forward in time) with a positive offset
"DELTA", and you subtract days (i.e., you go backwards in time) with
a negative offset.
Note that an exception ("invalid date") is raised if the given date
argument (the "start" date) does not constitute a valid date.
Beware that this method is limited to date calculations within a
single year (in contrast to the method with the same name from the
Date::Calendar module).
Therefore, the method does not only return a date (object), but also
a "rest" and a "sign".
The "rest" indicates how many days are still left from your original
DELTA after going in the desired direction and reaching a year
boundary.
The "sign" indicates in which direction (future or past) one needs to
go in order to "eat up" the "rest" (by subtracting a day from the
"rest" for each work day passed), or to adjust the resulting date (in
order to skip any holidays directly after a year boundary), if at
all.
The "sign" is -1 for going backwards in time, +1 for going forward,
and 0 if the result doesn't need any more fixing (for instance
because the result lies in the same year as the starting date).
The method "add_delta_workdays()" from the Date::Calendar module uses
the "rest" and "sign" return values from this method in order to
perform calculations which may cross year boundaries.
Therefore, it is not recommended to use this method here directly, as
it is rather clumsy to use, but to use the method with the same name
from the Date::Calendar module instead, which does the same but is
much easier to use and moreover allows calculations which cross an
arbitrary number of year boundaries.
BEWARE that this method may currently return unexpected (i.e.,
contradicting the above documentation) or plain wrong results when
going back in time (this is a bug!).
However, it works correctly and as documented above when going
forward in time.
o "$flag = $year->is_full(YEAR,MONTH,DAY|DATE);"
This method returns "true" ("1") if the bit corresponding to the
given date is set in the bit vector representing "full" holidays, and
"false" ("0") otherwise.
I.e., the method returns "true" if the given date is a (full) holiday
(according to the calendar profile associated with the given year
object).
o "$flag = $year->is_half(YEAR,MONTH,DAY|DATE);"
This method returns "true" ("1") if the bit corresponding to the
given date is set in the bit vector representing "half" holidays, and
"false" ("0") otherwise.
I.e., the method returns "true" if the given date is a half holiday
(according to the calendar profile associated with the given year
object).
Note that if a date is a "full" holiday, the "half" bit is never set,
even if you try to do so in your calendar profile, on purpose or by
accident.
o "$flag = $year->is_work(YEAR,MONTH,DAY|DATE);"
This method returns "true" ("1") if the bit corresponding to the
given date is set in the bit vector used to perform all sorts of
calculations, and "false" ("0") otherwise.
BEWARE that the "work" in this method's name does NOT come from "work
days"!
It comes from the fact that the corresponding bit vector can be used
for any "work" that you need to do. In other words, it's a "work
space".
Therefore, this bit vector might contain about everything you could
imagine - including a bit pattern which marks all "work days" with
set bits, if it so happens!
But you better don't rely on it, unless you put the bit pattern there
yourself in the first place.
Note that you can get a reference to this bit vector (in order to
fill it with any bit pattern you like) using the method "vec_work()",
described further above in this document.
The number of bits in this bit vector is the same as the number of
days in the given year "$year", which you can retrieve through either
""$days = $year->vec_work->Size();"" or ""$days =
$year->val_days();"".
See also Bit::Vector(3) for more details.
SEE ALSO
Bit::Vector(3), Date::Calendar(3), Date::Calendar::Profiles(3),
Date::Calc::Object(3), Date::Calc(3), Date::Calc::Util(3).
KNOWN BUGS
The method "add_delta_workdays()" is known to produce results which are
sometimes off by one working day when a negative offset is used. As a
workaround, try to add one working day first and then subtract one
working day more than initially intended. See also the file
"examples/bug.pl" for how to do this.
VERSION
This man page documents "Date::Calendar::Year" 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.
perl v5.26.3 2015-03-07 Date::Calendar::Year(3)
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