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=encoding utf8

=head1 NAME

Mail::Message::Field::Date - message header field with uris

=head1 INHERITANCE

 Mail::Message::Field::Date
   is a Mail::Message::Field::Structured
   is a Mail::Message::Field::Full
   is a Mail::Message::Field
   is a Mail::Reporter

=head1 SYNOPSIS

 my $f = Mail::Message::Field->new(Date => time);

=head1 DESCRIPTION

Dates are a little more tricky than it should be: the formatting permits
a few constructs more than other RFCs use for timestamps.  For instance,
a small subset of timezone abbreviations are permitted.

The studied date field will reformat the content into a standard
form.

Extends L<"DESCRIPTION" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"DESCRIPTION">.
 
=head1 OVERLOADED

Extends L<"OVERLOADED" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"OVERLOADED">.
 
=over 4

=item overload: B<"">

Inherited, see L<Mail::Message::Field/"OVERLOADED">

=item overload: B<0+>

Inherited, see L<Mail::Message::Field/"OVERLOADED">

=item overload: B<<=>>

Inherited, see L<Mail::Message::Field/"OVERLOADED">

=item overload: B<bool>

Inherited, see L<Mail::Message::Field/"OVERLOADED">

=item overload: B<cmp>

Inherited, see L<Mail::Message::Field/"OVERLOADED">

=item overload: B<stringification>

Inherited, see L<Mail::Message::Field::Full/"OVERLOADED">

=back

=head1 METHODS

Extends L<"METHODS" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"METHODS">.
 
=head2 Constructors

Extends L<"Constructors" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Constructors">.
 
=over 4

=item $obj-E<gt>B<clone>()

Inherited, see L<Mail::Message::Field/"Constructors">

=item Mail::Message::Field::Date-E<gt>B<from>($field, %options)

Inherited, see L<Mail::Message::Field::Full/"Constructors">

=item Mail::Message::Field::Date-E<gt>B<new>($data)

 -Option    --Defined in                      --Default
  attributes  Mail::Message::Field::Structured  <ignored>
  charset     Mail::Message::Field::Full        undef
  datum       Mail::Message::Field::Structured  undef
  encoding    Mail::Message::Field::Full        'q'
  force       Mail::Message::Field::Full        false
  language    Mail::Message::Field::Full        undef
  log         Mail::Reporter                    'WARNINGS'
  trace       Mail::Reporter                    'WARNINGS'

=over 2

=item attributes => ATTRS

=item charset => STRING

=item datum => STRING

=item encoding => 'q'|'Q'|'b'|'B'

=item force => BOOLEAN

=item language => STRING

=item log => LEVEL

=item trace => LEVEL

=back

example: 

 my $mmfd = 'Mail::Message::Field::Date';
 my $f = $mmfd->new(Date => time);

=back

=head2 The field

Extends L<"The field" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"The field">.
 
=over 4

=item $obj-E<gt>B<isStructured>()

=item Mail::Message::Field::Date-E<gt>B<isStructured>()

Inherited, see L<Mail::Message::Field/"The field">

=item $obj-E<gt>B<length>()

Inherited, see L<Mail::Message::Field/"The field">

=item $obj-E<gt>B<nrLines>()

Inherited, see L<Mail::Message::Field/"The field">

=item $obj-E<gt>B<print>( [$fh] )

Inherited, see L<Mail::Message::Field/"The field">

=item $obj-E<gt>B<size>()

Inherited, see L<Mail::Message::Field/"The field">

=item $obj-E<gt>B<string>( [$wrap] )

Inherited, see L<Mail::Message::Field/"The field">

=item $obj-E<gt>B<toDisclose>()

Inherited, see L<Mail::Message::Field/"The field">

=back

=head2 Access to the name

Extends L<"Access to the name" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Access to the name">.
 
=over 4

=item $obj-E<gt>B<Name>()

Inherited, see L<Mail::Message::Field/"Access to the name">

=item $obj-E<gt>B<name>()

Inherited, see L<Mail::Message::Field/"Access to the name">

=item $obj-E<gt>B<wellformedName>( [STRING] )

Inherited, see L<Mail::Message::Field/"Access to the name">

=back

=head2 Access to the body

Extends L<"Access to the body" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Access to the body">.
 
=over 4

=item $obj-E<gt>B<body>()

Inherited, see L<Mail::Message::Field/"Access to the body">

=item $obj-E<gt>B<decodedBody>(%options)

Inherited, see L<Mail::Message::Field::Full/"Access to the body">

=item $obj-E<gt>B<folded>()

Inherited, see L<Mail::Message::Field/"Access to the body">

=item $obj-E<gt>B<foldedBody>( [$body] )

Inherited, see L<Mail::Message::Field/"Access to the body">

=item $obj-E<gt>B<stripCFWS>( [STRING] )

=item Mail::Message::Field::Date-E<gt>B<stripCFWS>( [STRING] )

Inherited, see L<Mail::Message::Field/"Access to the body">

=item $obj-E<gt>B<unfoldedBody>( [$body, [$wrap]] )

Inherited, see L<Mail::Message::Field/"Access to the body">

=back

=head2 Access to the content

Extends L<"Access to the content" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Access to the content">.
 
=over 4

=item $obj-E<gt>B<addAttribute>(...)

Attributes are not supported for date fields.

=item $obj-E<gt>B<addresses>()

Inherited, see L<Mail::Message::Field/"Access to the content">

=item $obj-E<gt>B<attrPairs>()

Inherited, see L<Mail::Message::Field::Structured/"Access to the content">

=item $obj-E<gt>B<attribute>( $object|<STRING, %options>|<$name,$value,%options> )

Inherited, see L<Mail::Message::Field::Structured/"Access to the content">

=item $obj-E<gt>B<attributes>()

Inherited, see L<Mail::Message::Field::Structured/"Access to the content">

=item $obj-E<gt>B<beautify>()

Inherited, see L<Mail::Message::Field::Full/"Access to the content">

=item $obj-E<gt>B<comment>( [STRING] )

Inherited, see L<Mail::Message::Field/"Access to the content">

=item $obj-E<gt>B<createComment>(STRING, %options)

=item Mail::Message::Field::Date-E<gt>B<createComment>(STRING, %options)

Inherited, see L<Mail::Message::Field::Full/"Access to the content">

=item $obj-E<gt>B<createPhrase>(STRING, %options)

=item Mail::Message::Field::Date-E<gt>B<createPhrase>(STRING, %options)

Inherited, see L<Mail::Message::Field::Full/"Access to the content">

=item $obj-E<gt>B<study>()

Inherited, see L<Mail::Message::Field/"Access to the content">

=item $obj-E<gt>B<time>()

Convert date into a timestamp, as produced with POSIX::time().

=item $obj-E<gt>B<toDate>( [$time] )

=item Mail::Message::Field::Date-E<gt>B<toDate>( [$time] )

Inherited, see L<Mail::Message::Field/"Access to the content">

=item $obj-E<gt>B<toInt>()

Inherited, see L<Mail::Message::Field/"Access to the content">

=back

=head2 Other methods

Extends L<"Other methods" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Other methods">.
 
=over 4

=item $obj-E<gt>B<dateToTimestamp>(STRING)

=item Mail::Message::Field::Date-E<gt>B<dateToTimestamp>(STRING)

Inherited, see L<Mail::Message::Field/"Other methods">

=back

=head2 Internals

Extends L<"Internals" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Internals">.
 
=over 4

=item $obj-E<gt>B<consume>( $line | <$name,<$body|$objects>> )

Inherited, see L<Mail::Message::Field/"Internals">

=item $obj-E<gt>B<decode>(STRING, %options)

=item Mail::Message::Field::Date-E<gt>B<decode>(STRING, %options)

Inherited, see L<Mail::Message::Field::Full/"Internals">

=item $obj-E<gt>B<defaultWrapLength>( [$length] )

Inherited, see L<Mail::Message::Field/"Internals">

=item $obj-E<gt>B<encode>(STRING, %options)

Inherited, see L<Mail::Message::Field::Full/"Internals">

=item $obj-E<gt>B<fold>( $name, $body, [$maxchars] )

=item Mail::Message::Field::Date-E<gt>B<fold>( $name, $body, [$maxchars] )

Inherited, see L<Mail::Message::Field/"Internals">

=item $obj-E<gt>B<setWrapLength>( [$length] )

Inherited, see L<Mail::Message::Field/"Internals">

=item $obj-E<gt>B<stringifyData>(STRING|ARRAY|$objects)

Inherited, see L<Mail::Message::Field/"Internals">

=item $obj-E<gt>B<unfold>(STRING)

Inherited, see L<Mail::Message::Field/"Internals">

=back

=head2 Parsing

Extends L<"Parsing" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Parsing">.
 
=over 4

=item $obj-E<gt>B<consumeComment>(STRING)

=item Mail::Message::Field::Date-E<gt>B<consumeComment>(STRING)

Inherited, see L<Mail::Message::Field::Full/"Parsing">

=item $obj-E<gt>B<consumeDotAtom>(STRING)

Inherited, see L<Mail::Message::Field::Full/"Parsing">

=item $obj-E<gt>B<consumePhrase>(STRING)

=item Mail::Message::Field::Date-E<gt>B<consumePhrase>(STRING)

Inherited, see L<Mail::Message::Field::Full/"Parsing">

=item $obj-E<gt>B<datum>( [$value] )

Inherited, see L<Mail::Message::Field::Structured/"Parsing">

=item $obj-E<gt>B<parse>(STRING)

Inherited, see L<Mail::Message::Field::Full/"Parsing">

=item $obj-E<gt>B<produceBody>()

Inherited, see L<Mail::Message::Field::Full/"Parsing">

=back

=head2 Error handling

Extends L<"Error handling" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Error handling">.
 
=over 4

=item $obj-E<gt>B<AUTOLOAD>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<addReport>($object)

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )

=item Mail::Message::Field::Date-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<errors>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<log>( [$level, [$strings]] )

=item Mail::Message::Field::Date-E<gt>B<log>( [$level, [$strings]] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<logPriority>($level)

=item Mail::Message::Field::Date-E<gt>B<logPriority>($level)

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<logSettings>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<notImplemented>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<report>( [$level] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<reportAll>( [$level] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<trace>( [$level] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<warnings>()

Inherited, see L<Mail::Reporter/"Error handling">

=back

=head2 Cleanup

Extends L<"Cleanup" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"Cleanup">.
 
=over 4

=item $obj-E<gt>B<DESTROY>()

Inherited, see L<Mail::Reporter/"Cleanup">

=back

=head1 DETAILS

Extends L<"DETAILS" in Mail::Message::Field::Structured|Mail::Message::Field::Structured/"DETAILS">.
 
=head1 DIAGNOSTICS

=over 4

=item Warning: Field content is not numerical: $content

The numeric value of a field is requested (for instance the C<Lines> or
C<Content-Length> fields should be numerical), however the data contains
weird characters.

=item Warning: Illegal character in charset '$charset'

The field is created with an utf8 string which only contains data from the
specified character set.  However, that character set can never be a valid
name because it contains characters which are not permitted.

=item Warning: Illegal character in field name $name

A new field is being created which does contain characters not permitted
by the RFCs.  Using this field in messages may break other e-mail clients
or transfer agents, and therefore mutulate or extinguish your message.

=item Warning: Illegal character in language '$lang'

The field is created with data which is specified to be in a certain language,
however, the name of the language cannot be valid: it contains characters
which are not permitted by the RFCs.

=item Warning: Illegal encoding '$encoding', used 'q'

The RFCs only permit base64 (C<b > or C<B >) or quoted-printable
(C<q> or C<Q>) encoding.  Other than these four options are illegal.

=item Error: No attributes for date fields.

Is is not possible to add attributes to date fields: it is not permitted
by the RFCs.

=item Error: Package $package does not implement $method.

Fatal error: the specific package (or one of its superclasses) does not
implement this method where it should. This message means that some other
related classes do implement this method however the class at hand does
not.  Probably you should investigate this and probably inform the author
of the package.

=back

=head1 SEE ALSO

This module is part of Mail-Box distribution version 2.117,
built on August 24, 2014. Website: F<http://perl.overmeer.net/mailbox/>

=head1 LICENSE

Copyrights 2001-2014 by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://www.perl.com/perl/misc/Artistic.html>