NAME
    DateTime::Format::HTTP - Date conversion routines

SYNOPSIS
        use DateTime::Format::HTTP;

        my $class = 'DateTime::Format::HTTP';
        $string = $class->format_datetime($dt); # Format as GMT ASCII time
        $time = $class->parse_datetime($string); # convert ASCII date to machine time

DESCRIPTION
    This module provides functions that deal the date formats used by the
    HTTP protocol (and then some more).

METHODS
  parse_datetime( $str [, $zone] )

    The parse_datetime() function converts a string to machine time. It
    throws an error if the format of $str is unrecognized, or the time is
    outside the representable range. The time formats recognized are listed
    below.

    The function also takes an optional second argument that specifies the
    default time zone to use when converting the date. This parameter is
    ignored if the zone is found in the date string itself. If this
    parameter is missing, and the date string format does not contain any
    zone specification, then the floating time zone is used.

    The zone should be one that is recognized by DateTime::TimeZone.

    Actual parsing is done with the HTTP::Date module. At the time of
    writing it supports the formats listed next. Consult that module's
    documentation in case the list has been changed.

     "Wed, 09 Feb 1994 22:23:32 GMT"       -- HTTP format
     "Thu Feb  3 17:03:55 GMT 1994"        -- ctime(3) format
     "Thu Feb  3 00:00:00 1994",           -- ANSI C asctime() format
     "Tuesday, 08-Feb-94 14:15:29 GMT"     -- old rfc850 HTTP format
     "Tuesday, 08-Feb-1994 14:15:29 GMT"   -- broken rfc850 HTTP format

     "03/Feb/1994:17:03:55 -0700"   -- common logfile format
     "09 Feb 1994 22:23:32 GMT"     -- HTTP format (no weekday)
     "08-Feb-94 14:15:29 GMT"       -- rfc850 format (no weekday)
     "08-Feb-1994 14:15:29 GMT"     -- broken rfc850 format (no weekday)

     "1994-02-03 14:15:29 -0100"    -- ISO 8601 format
     "1994-02-03 14:15:29"          -- zone is optional
     "1994-02-03"                   -- only date
     "1994-02-03T14:15:29"          -- Use T as separator
     "19940203T141529Z"             -- ISO 8601 compact format
     "19940203"                     -- only date

     "08-Feb-94"         -- old rfc850 HTTP format    (no weekday, no time)
     "08-Feb-1994"       -- broken rfc850 HTTP format (no weekday, no time)
     "09 Feb 1994"       -- proposed new HTTP format  (no weekday, no time)
     "03/Feb/1994"       -- common logfile format     (no time, no offset)

     "Feb  3  1994"      -- Unix 'ls -l' format
     "Feb  3 17:03"      -- Unix 'ls -l' format

     "11-15-96  03:52PM" -- Windows 'dir' format

    The parser ignores leading and trailing whitespace. It also allow the
    seconds to be missing and the month to be numerical in most formats.

    If the year is missing, then we assume that the date is the first
    matching date *before* current month. If the year is given with only 2
    digits, then parse_date() will select the century that makes the year
    closest to the current date.

  format_datetime()

    The `format_datetime()' method converts a DateTime to a string. If the
    function is called without an argument, it will use the current time.

    The string returned is in the format preferred for the HTTP protocol.
    This is a fixed length subset of the format defined by RFC 1123,
    represented in Universal Time (GMT). An example of a time stamp in this
    format is:

       Sun, 06 Nov 1994 08:49:37 GMT

  format_iso( [$time] )

    Same as format_datetime(), but returns a "YYYY-MM-DD hh:mm:ss"-formatted
    string representing time in the local time zone. It is strongly
    recommended that you use `format_isoz' or `format_datetime' instead (as
    these provide time zone indication).

  format_isoz( [$dt] )

    Same as format_iso(), but returns a "YYYY-MM-DD hh:mm:ssZ"-formatted
    string representing Universal Time.

THANKS
    Gisle Aas (GAAS) for writing HTTP::Date.

    Iain, for never quite finishing `HTTP::Date::XS'.

SUPPORT
    Support for this module is provided via the datetime@perl.org email
    list. See http://lists.perl.org/ for more details.

    Alternatively, log them via the CPAN RT system via the web or email:

        http://rt.cpan.org/NoAuth/ReportBug.html?Queue=DateTime%3A%3AFormat%3A%3AHTTP
        bug-datetime-format-http@rt.cpan.org

    This makes it much easier for me to track things and thus means your
    problem is less likely to be neglected.

LICENCE AND COPYRIGHT
    Copyright Iain Truskett, 2003. All rights reserved. Sections of the
    documentation Gisle Aas, 1995-1999. Changes since version 0.35 copyright
    David Rolsky, 2004.

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself, either Perl version 5.000 or, at
    your option, any later version of Perl 5 you may have available.

    The full text of the licences can be found in the Artistic and COPYING
    files included with this module, or in perlartistic and perlgpl as
    supplied with Perl 5.8.1 and later.

AUTHOR
    Originally written by Iain Truskett <spoon@cpan.org>, who died on
    December 29, 2003.

    Maintained by Dave Rolsky <autarch@urth.org>.

SEE ALSO
    `datetime@perl.org' mailing list.

    http://datetime.perl.org/

    perl, DateTime, HTTP::Date, DateTime::TimeZone.