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Date::Manip::Obj(3pm) User Contributed Perl Documentation Date::Manip::Obj(3pm)
NAME
Date::Manip::Obj - Base class for Date::Manip objects
SYNOPSIS
The Date::Manip::Obj class is the base class used for the following Date::Manip classes:
Date::Manip::Base
Date::Manip::TZ
Date::Manip::Date
Date::Manip::Delta
Date::Manip::Recur
This module is not intended to be called directly and performs no useful function by
itself. Instead, use the various derived classes which inherit from it.
DESCRIPTION
This module contains a set of methods used by all Date::Manip classes listed above.
You should be familiar with the Date::Manip::Objects and Date::Manip::Config
documentation.
In the method descriptions below, Date::Manip::Date objects will usually be used as
examples, but (unless otherwise stated), all of the classes listed above have the same
methods, and work in the same fashion.
METHODS FOR CREATING OBJECTS
In the examples below, any variable named some variation of $date ($date, $date1, $date2,
...) is a Date::Manip::Date object. Similarly, $delta, $recur, $tz, and $base refer to
objects in the appropriate class.
Any $obj variable refers to an object in any of the classes.
new There are two ways to use the new method. They are:
$obj2 = new CLASS ($obj1,$string,@parse_opts,\@opts);
$obj2 = $obj1->new($string,@parse_opts,\@opts)
In both cases, all arguments are optional.
Both methods are used to create a new object of a given class. In the first case,
CLASS is the class of the new object. For example:
$date = new Date::Manip::Date;
$delta = new Date::Manip::Delta;
In the second method, the class of the new object will be derived from the first
object. For example:
$date1 = new Date::Manip::Date;
$date2 = $date1->new();
the class of the second object ($date2) is Date::Manip::Date because that is the class
of the object ($date1) used to create it.
In both first method (when a $obj1 is passed in) and always in the second method, the
new object will share as much information from the old object ($obj1) as possible.
For example, if you call either of these:
$date2 = new Date::Manip::Date $date1;
$date2 = $date1->new();
the new date object will use the same embedded Date::Manip::TZ and Date::Manip::Base
objects.
When specifying CLASS and including an old object, objects do not need to be of the
same class. For example, the following are all valid:
$date = new Date::Manip::Date $delta;
$date = new Date::Manip::Date $tz;
You can even do:
$date = new Date::Manip::Date $base;
but this will have to create a completely new Date::Manip::TZ object, which means that
optimal performance may not be achieved if a Date::Manip::TZ object already exists.
There are two special cases. Either of the following will create a new
Date::Manip::Base object for handling multiple configurations:
$base2 = new Date::Manip::Base $base1;
$base2 = $base1->new();
Either of the following will create a new Date::Manip::TZ object with the same
Date::Manip::Base object embedded in it:
$tz2 = new Date::Manip::TZ $tz1;
$tz2 = $tz1->new();
The new base object will initially have the same configuration as the original base
object, but changing it's configuration will not affect the original base object.
If the "\@opts" argument is passed in, it is a list reference containing a list
suitable for passing to the config method (described below). In this case, a new
Date::Manip::Base object (and perhaps Date::Manip::TZ object) will be created. The new
Base object will start as identical to the original one (if a previously defined
object was used to create the new object) with the additional options in @opts added.
In other words, the following are equivalent:
$date = new Date::Manip::Date $obj,\@opts;
$base = $obj->base();
$base2 = $base->new();
$date = new Date::Manip::Date $base2;
$date->config(@opts);
It should be noted that the options are applied to the NEW Date::Manip::Base object,
not the old one.
An optional string ($string and parse opts @parse_opts) may be passed in only when
creating a Date::Manip::Date, Date::Manip::Delta, or Date::Manip::Recur object. If
passed in when creating a Date::Manip::TZ or Date::Manip::Base object, a warning will
be issued, but execution will continue.
If the string is included, it will be parsed to give an initial value to the object.
This will only be done AFTER any options are handled, so the following are equivalent:
$date = new Date::Manip::Date $string,@parse_opts,\@opts;
$date = new Date::Manip::Date;
$date->config(@opts);
$date->parse($string,@parse_opts);
Once a Date::Manip::Date object (or any object in any other Date::Manip class) is
created, it should always be used to create additional objects in order to preserve
cached data for optimal performance and memory usage.
The one caveat is if you are working with multiple configurations as described in the
Date::Manip::Objects document. In that case, you may need to create completely new
objects to allow multiple Date::Manip::Base objects to be used.
new_config
$obj2 = $obj1->new_config($string,\@opts);
This creates a new instance with a new Date::Manip::Base object (and possibly a new
Date::Manip::TZ object).
For example,
$date2 = $date1->new_config();
creates a new Date::Manip::Date object with a new Date::Manip::TZ (and
Date::Manip::Base) object. Initially, it is the same configuration as the original
object.
If the object is a Date::Manip::Base object, the following are equivalent:
$base2 = $base1->new_config();
$base2 = $base1->new();
Both $string and "\@opts" are optional. They are used in the same way they are used in
the new method.
new_date
new_delta
new_recur
These are shortcuts for specifying the class. The following sets of calls are all
equivalent:
$date = $obj->new_date();
$date = new Date::Manip::Date($obj);
$delta = $obj->new_delta();
$delta = new Date::Manip::Date($obj);
These methods all allow optional "($string,\@opts)" arguments.
OTHER METHODS
base
tz
$base = $obj->base();
This returns the Date::Manip::Base object associated with the given object.
If $obj is a Date::Manip::Base object, nothing is returned (i.e. it doesn't create a
new copy of the object).
$tz = $obj->tz();
This returns the Date::Manip::TZ object associated with the given object. If $obj is a
Date::Manip::TZ or Date::Manip::Base object, nothing is returned.
config
$obj->config($var1,$val1,$var2,$val2,...);
This will set the value of any configuration variables. Please refer to the
Date::Manip::Config manual for a list of all configuration variables and their
description.
get_config
@var = $obj->get_config();
$val = $obj->get_config($var1);
@val = $obj->get_config($var1,$var2,...);
This queries the current config values. With no argument, it will return the list of
config variables (all lowercase).
With one or more arguments, it returns the current values for the config variables
passed in (case insensitive).
err
$err = $obj->err();
This will return the full error message if the previous operation failed for any
reason.
$obj->err(1);
will clear the error code.
is_date
is_delta
is_recur
$flag = $obj->is_date();
Returns 0 or 1, depending on the object. For example, a Date::Manip::Date object
returns 1 with the is_date method, and 0 for the other two.
version
$vers = $obj->version($flag);
This returns the version of Date::Manip.
If $flag is passed in, and $obj is not a Date::Manip::Base object, the version and
timezone information will be passed back.
KNOWN BUGS
None known.
BUGS AND QUESTIONS
Please refer to the Date::Manip::Problems documentation for information on submitting bug
reports or questions to the author.
SEE ALSO
Date::Manip - main module documentation
LICENSE
This script is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
AUTHOR
Sullivan Beck (sbeck AT cpan.org)
perl v5.32.1 2021-11-20 Date::Manip::Obj(3pm)
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On Apache
Under GNU General Public License
2024-12-12 20:04 @18.118.28.89 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)