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 [email protected] 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
       [email protected]

   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 <[email protected]>, who died on
   December 29, 2003.

   Maintained by Dave Rolsky <[email protected]> and Christiaan Kras
   <[email protected]>

SEE ALSO
   "[email protected]" mailing list.

   http://datetime.perl.org/

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

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