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   1  <?php
   2  /**
   3   * SimplePie
   4   *
   5   * A PHP-Based RSS and Atom Feed Framework.
   6   * Takes the hard work out of managing a complete RSS/Atom solution.
   7   *
   8   * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
   9   * All rights reserved.
  10   *
  11   * Redistribution and use in source and binary forms, with or without modification, are
  12   * permitted provided that the following conditions are met:
  13   *
  14   *     * Redistributions of source code must retain the above copyright notice, this list of
  15   *       conditions and the following disclaimer.
  16   *
  17   *     * Redistributions in binary form must reproduce the above copyright notice, this list
  18   *       of conditions and the following disclaimer in the documentation and/or other materials
  19   *       provided with the distribution.
  20   *
  21   *     * Neither the name of the SimplePie Team nor the names of its contributors may be used
  22   *       to endorse or promote products derived from this software without specific prior
  23   *       written permission.
  24   *
  25   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
  26   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  27   * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
  28   * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  32   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33   * POSSIBILITY OF SUCH DAMAGE.
  34   *
  35   * @package SimplePie
  36   * @version 1.3.1
  37   * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
  38   * @author Ryan Parman
  39   * @author Geoffrey Sneddon
  40   * @author Ryan McCue
  41   * @link http://simplepie.org/ SimplePie
  42   * @license http://www.opensource.org/licenses/bsd-license.php BSD License
  43   */
  44  
  45  
  46  /**
  47   * Date Parser
  48   *
  49   * @package SimplePie
  50   * @subpackage Parsing
  51   */
  52  class SimplePie_Parse_Date
  53  {
  54      /**
  55       * Input data
  56       *
  57       * @access protected
  58       * @var string
  59       */
  60      var $date;
  61  
  62      /**
  63       * List of days, calendar day name => ordinal day number in the week
  64       *
  65       * @access protected
  66       * @var array
  67       */
  68      var $day = array(
  69          // English
  70          'mon' => 1,
  71          'monday' => 1,
  72          'tue' => 2,
  73          'tuesday' => 2,
  74          'wed' => 3,
  75          'wednesday' => 3,
  76          'thu' => 4,
  77          'thursday' => 4,
  78          'fri' => 5,
  79          'friday' => 5,
  80          'sat' => 6,
  81          'saturday' => 6,
  82          'sun' => 7,
  83          'sunday' => 7,
  84          // Dutch
  85          'maandag' => 1,
  86          'dinsdag' => 2,
  87          'woensdag' => 3,
  88          'donderdag' => 4,
  89          'vrijdag' => 5,
  90          'zaterdag' => 6,
  91          'zondag' => 7,
  92          // French
  93          'lundi' => 1,
  94          'mardi' => 2,
  95          'mercredi' => 3,
  96          'jeudi' => 4,
  97          'vendredi' => 5,
  98          'samedi' => 6,
  99          'dimanche' => 7,
 100          // German
 101          'montag' => 1,
 102          'dienstag' => 2,
 103          'mittwoch' => 3,
 104          'donnerstag' => 4,
 105          'freitag' => 5,
 106          'samstag' => 6,
 107          'sonnabend' => 6,
 108          'sonntag' => 7,
 109          // Italian
 110          'lunedì' => 1,
 111          'martedì' => 2,
 112          'mercoledì' => 3,
 113          'giovedì' => 4,
 114          'venerdì' => 5,
 115          'sabato' => 6,
 116          'domenica' => 7,
 117          // Spanish
 118          'lunes' => 1,
 119          'martes' => 2,
 120          'miércoles' => 3,
 121          'jueves' => 4,
 122          'viernes' => 5,
 123          'sábado' => 6,
 124          'domingo' => 7,
 125          // Finnish
 126          'maanantai' => 1,
 127          'tiistai' => 2,
 128          'keskiviikko' => 3,
 129          'torstai' => 4,
 130          'perjantai' => 5,
 131          'lauantai' => 6,
 132          'sunnuntai' => 7,
 133          // Hungarian
 134          'hétfő' => 1,
 135          'kedd' => 2,
 136          'szerda' => 3,
 137          'csütörtok' => 4,
 138          'péntek' => 5,
 139          'szombat' => 6,
 140          'vasárnap' => 7,
 141          // Greek
 142          'Δευ' => 1,
 143          'Τρι' => 2,
 144          'Τετ' => 3,
 145          'Πεμ' => 4,
 146          'Παρ' => 5,
 147          'Σαβ' => 6,
 148          'Κυρ' => 7,
 149      );
 150  
 151      /**
 152       * List of months, calendar month name => calendar month number
 153       *
 154       * @access protected
 155       * @var array
 156       */
 157      var $month = array(
 158          // English
 159          'jan' => 1,
 160          'january' => 1,
 161          'feb' => 2,
 162          'february' => 2,
 163          'mar' => 3,
 164          'march' => 3,
 165          'apr' => 4,
 166          'april' => 4,
 167          'may' => 5,
 168          // No long form of May
 169          'jun' => 6,
 170          'june' => 6,
 171          'jul' => 7,
 172          'july' => 7,
 173          'aug' => 8,
 174          'august' => 8,
 175          'sep' => 9,
 176          'september' => 8,
 177          'oct' => 10,
 178          'october' => 10,
 179          'nov' => 11,
 180          'november' => 11,
 181          'dec' => 12,
 182          'december' => 12,
 183          // Dutch
 184          'januari' => 1,
 185          'februari' => 2,
 186          'maart' => 3,
 187          'april' => 4,
 188          'mei' => 5,
 189          'juni' => 6,
 190          'juli' => 7,
 191          'augustus' => 8,
 192          'september' => 9,
 193          'oktober' => 10,
 194          'november' => 11,
 195          'december' => 12,
 196          // French
 197          'janvier' => 1,
 198          'février' => 2,
 199          'mars' => 3,
 200          'avril' => 4,
 201          'mai' => 5,
 202          'juin' => 6,
 203          'juillet' => 7,
 204          'août' => 8,
 205          'septembre' => 9,
 206          'octobre' => 10,
 207          'novembre' => 11,
 208          'décembre' => 12,
 209          // German
 210          'januar' => 1,
 211          'februar' => 2,
 212          'märz' => 3,
 213          'april' => 4,
 214          'mai' => 5,
 215          'juni' => 6,
 216          'juli' => 7,
 217          'august' => 8,
 218          'september' => 9,
 219          'oktober' => 10,
 220          'november' => 11,
 221          'dezember' => 12,
 222          // Italian
 223          'gennaio' => 1,
 224          'febbraio' => 2,
 225          'marzo' => 3,
 226          'aprile' => 4,
 227          'maggio' => 5,
 228          'giugno' => 6,
 229          'luglio' => 7,
 230          'agosto' => 8,
 231          'settembre' => 9,
 232          'ottobre' => 10,
 233          'novembre' => 11,
 234          'dicembre' => 12,
 235          // Spanish
 236          'enero' => 1,
 237          'febrero' => 2,
 238          'marzo' => 3,
 239          'abril' => 4,
 240          'mayo' => 5,
 241          'junio' => 6,
 242          'julio' => 7,
 243          'agosto' => 8,
 244          'septiembre' => 9,
 245          'setiembre' => 9,
 246          'octubre' => 10,
 247          'noviembre' => 11,
 248          'diciembre' => 12,
 249          // Finnish
 250          'tammikuu' => 1,
 251          'helmikuu' => 2,
 252          'maaliskuu' => 3,
 253          'huhtikuu' => 4,
 254          'toukokuu' => 5,
 255          'kesäkuu' => 6,
 256          'heinäkuu' => 7,
 257          'elokuu' => 8,
 258          'suuskuu' => 9,
 259          'lokakuu' => 10,
 260          'marras' => 11,
 261          'joulukuu' => 12,
 262          // Hungarian
 263          'január' => 1,
 264          'február' => 2,
 265          'március' => 3,
 266          'április' => 4,
 267          'május' => 5,
 268          'június' => 6,
 269          'július' => 7,
 270          'augusztus' => 8,
 271          'szeptember' => 9,
 272          'október' => 10,
 273          'november' => 11,
 274          'december' => 12,
 275          // Greek
 276          'Ιαν' => 1,
 277          'Φεβ' => 2,
 278          'Μάώ' => 3,
 279          'Μαώ' => 3,
 280          'Απρ' => 4,
 281          'Μάι' => 5,
 282          'Μαϊ' => 5,
 283          'Μαι' => 5,
 284          'Ιούν' => 6,
 285          'Ιον' => 6,
 286          'Ιούλ' => 7,
 287          'Ιολ' => 7,
 288          'Αύγ' => 8,
 289          'Αυγ' => 8,
 290          'Σεπ' => 9,
 291          'Οκτ' => 10,
 292          'Νοέ' => 11,
 293          'Δεκ' => 12,
 294      );
 295  
 296      /**
 297       * List of timezones, abbreviation => offset from UTC
 298       *
 299       * @access protected
 300       * @var array
 301       */
 302      var $timezone = array(
 303          'ACDT' => 37800,
 304          'ACIT' => 28800,
 305          'ACST' => 34200,
 306          'ACT' => -18000,
 307          'ACWDT' => 35100,
 308          'ACWST' => 31500,
 309          'AEDT' => 39600,
 310          'AEST' => 36000,
 311          'AFT' => 16200,
 312          'AKDT' => -28800,
 313          'AKST' => -32400,
 314          'AMDT' => 18000,
 315          'AMT' => -14400,
 316          'ANAST' => 46800,
 317          'ANAT' => 43200,
 318          'ART' => -10800,
 319          'AZOST' => -3600,
 320          'AZST' => 18000,
 321          'AZT' => 14400,
 322          'BIOT' => 21600,
 323          'BIT' => -43200,
 324          'BOT' => -14400,
 325          'BRST' => -7200,
 326          'BRT' => -10800,
 327          'BST' => 3600,
 328          'BTT' => 21600,
 329          'CAST' => 18000,
 330          'CAT' => 7200,
 331          'CCT' => 23400,
 332          'CDT' => -18000,
 333          'CEDT' => 7200,
 334          'CET' => 3600,
 335          'CGST' => -7200,
 336          'CGT' => -10800,
 337          'CHADT' => 49500,
 338          'CHAST' => 45900,
 339          'CIST' => -28800,
 340          'CKT' => -36000,
 341          'CLDT' => -10800,
 342          'CLST' => -14400,
 343          'COT' => -18000,
 344          'CST' => -21600,
 345          'CVT' => -3600,
 346          'CXT' => 25200,
 347          'DAVT' => 25200,
 348          'DTAT' => 36000,
 349          'EADT' => -18000,
 350          'EAST' => -21600,
 351          'EAT' => 10800,
 352          'ECT' => -18000,
 353          'EDT' => -14400,
 354          'EEST' => 10800,
 355          'EET' => 7200,
 356          'EGT' => -3600,
 357          'EKST' => 21600,
 358          'EST' => -18000,
 359          'FJT' => 43200,
 360          'FKDT' => -10800,
 361          'FKST' => -14400,
 362          'FNT' => -7200,
 363          'GALT' => -21600,
 364          'GEDT' => 14400,
 365          'GEST' => 10800,
 366          'GFT' => -10800,
 367          'GILT' => 43200,
 368          'GIT' => -32400,
 369          'GST' => 14400,
 370          'GST' => -7200,
 371          'GYT' => -14400,
 372          'HAA' => -10800,
 373          'HAC' => -18000,
 374          'HADT' => -32400,
 375          'HAE' => -14400,
 376          'HAP' => -25200,
 377          'HAR' => -21600,
 378          'HAST' => -36000,
 379          'HAT' => -9000,
 380          'HAY' => -28800,
 381          'HKST' => 28800,
 382          'HMT' => 18000,
 383          'HNA' => -14400,
 384          'HNC' => -21600,
 385          'HNE' => -18000,
 386          'HNP' => -28800,
 387          'HNR' => -25200,
 388          'HNT' => -12600,
 389          'HNY' => -32400,
 390          'IRDT' => 16200,
 391          'IRKST' => 32400,
 392          'IRKT' => 28800,
 393          'IRST' => 12600,
 394          'JFDT' => -10800,
 395          'JFST' => -14400,
 396          'JST' => 32400,
 397          'KGST' => 21600,
 398          'KGT' => 18000,
 399          'KOST' => 39600,
 400          'KOVST' => 28800,
 401          'KOVT' => 25200,
 402          'KRAST' => 28800,
 403          'KRAT' => 25200,
 404          'KST' => 32400,
 405          'LHDT' => 39600,
 406          'LHST' => 37800,
 407          'LINT' => 50400,
 408          'LKT' => 21600,
 409          'MAGST' => 43200,
 410          'MAGT' => 39600,
 411          'MAWT' => 21600,
 412          'MDT' => -21600,
 413          'MESZ' => 7200,
 414          'MEZ' => 3600,
 415          'MHT' => 43200,
 416          'MIT' => -34200,
 417          'MNST' => 32400,
 418          'MSDT' => 14400,
 419          'MSST' => 10800,
 420          'MST' => -25200,
 421          'MUT' => 14400,
 422          'MVT' => 18000,
 423          'MYT' => 28800,
 424          'NCT' => 39600,
 425          'NDT' => -9000,
 426          'NFT' => 41400,
 427          'NMIT' => 36000,
 428          'NOVST' => 25200,
 429          'NOVT' => 21600,
 430          'NPT' => 20700,
 431          'NRT' => 43200,
 432          'NST' => -12600,
 433          'NUT' => -39600,
 434          'NZDT' => 46800,
 435          'NZST' => 43200,
 436          'OMSST' => 25200,
 437          'OMST' => 21600,
 438          'PDT' => -25200,
 439          'PET' => -18000,
 440          'PETST' => 46800,
 441          'PETT' => 43200,
 442          'PGT' => 36000,
 443          'PHOT' => 46800,
 444          'PHT' => 28800,
 445          'PKT' => 18000,
 446          'PMDT' => -7200,
 447          'PMST' => -10800,
 448          'PONT' => 39600,
 449          'PST' => -28800,
 450          'PWT' => 32400,
 451          'PYST' => -10800,
 452          'PYT' => -14400,
 453          'RET' => 14400,
 454          'ROTT' => -10800,
 455          'SAMST' => 18000,
 456          'SAMT' => 14400,
 457          'SAST' => 7200,
 458          'SBT' => 39600,
 459          'SCDT' => 46800,
 460          'SCST' => 43200,
 461          'SCT' => 14400,
 462          'SEST' => 3600,
 463          'SGT' => 28800,
 464          'SIT' => 28800,
 465          'SRT' => -10800,
 466          'SST' => -39600,
 467          'SYST' => 10800,
 468          'SYT' => 7200,
 469          'TFT' => 18000,
 470          'THAT' => -36000,
 471          'TJT' => 18000,
 472          'TKT' => -36000,
 473          'TMT' => 18000,
 474          'TOT' => 46800,
 475          'TPT' => 32400,
 476          'TRUT' => 36000,
 477          'TVT' => 43200,
 478          'TWT' => 28800,
 479          'UYST' => -7200,
 480          'UYT' => -10800,
 481          'UZT' => 18000,
 482          'VET' => -14400,
 483          'VLAST' => 39600,
 484          'VLAT' => 36000,
 485          'VOST' => 21600,
 486          'VUT' => 39600,
 487          'WAST' => 7200,
 488          'WAT' => 3600,
 489          'WDT' => 32400,
 490          'WEST' => 3600,
 491          'WFT' => 43200,
 492          'WIB' => 25200,
 493          'WIT' => 32400,
 494          'WITA' => 28800,
 495          'WKST' => 18000,
 496          'WST' => 28800,
 497          'YAKST' => 36000,
 498          'YAKT' => 32400,
 499          'YAPT' => 36000,
 500          'YEKST' => 21600,
 501          'YEKT' => 18000,
 502      );
 503  
 504      /**
 505       * Cached PCRE for SimplePie_Parse_Date::$day
 506       *
 507       * @access protected
 508       * @var string
 509       */
 510      var $day_pcre;
 511  
 512      /**
 513       * Cached PCRE for SimplePie_Parse_Date::$month
 514       *
 515       * @access protected
 516       * @var string
 517       */
 518      var $month_pcre;
 519  
 520      /**
 521       * Array of user-added callback methods
 522       *
 523       * @access private
 524       * @var array
 525       */
 526      var $built_in = array();
 527  
 528      /**
 529       * Array of user-added callback methods
 530       *
 531       * @access private
 532       * @var array
 533       */
 534      var $user = array();
 535  
 536      /**
 537       * Create new SimplePie_Parse_Date object, and set self::day_pcre,
 538       * self::month_pcre, and self::built_in
 539       *
 540       * @access private
 541       */
 542  	public function __construct()
 543      {
 544          $this->day_pcre = '(' . implode(array_keys($this->day), '|') . ')';
 545          $this->month_pcre = '(' . implode(array_keys($this->month), '|') . ')';
 546  
 547          static $cache;
 548          if (!isset($cache[get_class($this)]))
 549          {
 550              $all_methods = get_class_methods($this);
 551  
 552              foreach ($all_methods as $method)
 553              {
 554                  if (strtolower(substr($method, 0, 5)) === 'date_')
 555                  {
 556                      $cache[get_class($this)][] = $method;
 557                  }
 558              }
 559          }
 560  
 561          foreach ($cache[get_class($this)] as $method)
 562          {
 563              $this->built_in[] = $method;
 564          }
 565      }
 566  
 567      /**
 568       * Get the object
 569       *
 570       * @access public
 571       */
 572  	public static function get()
 573      {
 574          static $object;
 575          if (!$object)
 576          {
 577              $object = new SimplePie_Parse_Date;
 578          }
 579          return $object;
 580      }
 581  
 582      /**
 583       * Parse a date
 584       *
 585       * @final
 586       * @access public
 587       * @param string $date Date to parse
 588       * @return int Timestamp corresponding to date string, or false on failure
 589       */
 590  	public function parse($date)
 591      {
 592          foreach ($this->user as $method)
 593          {
 594              if (($returned = call_user_func($method, $date)) !== false)
 595              {
 596                  return $returned;
 597              }
 598          }
 599  
 600          foreach ($this->built_in as $method)
 601          {
 602              if (($returned = call_user_func(array($this, $method), $date)) !== false)
 603              {
 604                  return $returned;
 605              }
 606          }
 607  
 608          return false;
 609      }
 610  
 611      /**
 612       * Add a callback method to parse a date
 613       *
 614       * @final
 615       * @access public
 616       * @param callback $callback
 617       */
 618  	public function add_callback($callback)
 619      {
 620          if (is_callable($callback))
 621          {
 622              $this->user[] = $callback;
 623          }
 624          else
 625          {
 626              trigger_error('User-supplied function must be a valid callback', E_USER_WARNING);
 627          }
 628      }
 629  
 630      /**
 631       * Parse a superset of W3C-DTF (allows hyphens and colons to be omitted, as
 632       * well as allowing any of upper or lower case "T", horizontal tabs, or
 633       * spaces to be used as the time seperator (including more than one))
 634       *
 635       * @access protected
 636       * @return int Timestamp
 637       */
 638  	public function date_w3cdtf($date)
 639      {
 640          static $pcre;
 641          if (!$pcre)
 642          {
 643              $year = '([0-9]{4})';
 644              $month = $day = $hour = $minute = $second = '([0-9]{2})';
 645              $decimal = '([0-9]*)';
 646              $zone = '(?:(Z)|([+\-])([0-9]{1,2}):?([0-9]{1,2}))';
 647              $pcre = '/^' . $year . '(?:-?' . $month . '(?:-?' . $day . '(?:[Tt\x09\x20]+' . $hour . '(?::?' . $minute . '(?::?' . $second . '(?:.' . $decimal . ')?)?)?' . $zone . ')?)?)?$/';
 648          }
 649          if (preg_match($pcre, $date, $match))
 650          {
 651              /*
 652              Capturing subpatterns:
 653              1: Year
 654              2: Month
 655              3: Day
 656              4: Hour
 657              5: Minute
 658              6: Second
 659              7: Decimal fraction of a second
 660              8: Zulu
 661              9: Timezone ±
 662              10: Timezone hours
 663              11: Timezone minutes
 664              */
 665  
 666              // Fill in empty matches
 667              for ($i = count($match); $i <= 3; $i++)
 668              {
 669                  $match[$i] = '1';
 670              }
 671  
 672              for ($i = count($match); $i <= 7; $i++)
 673              {
 674                  $match[$i] = '0';
 675              }
 676  
 677              // Numeric timezone
 678              if (isset($match[9]) && $match[9] !== '')
 679              {
 680                  $timezone = $match[10] * 3600;
 681                  $timezone += $match[11] * 60;
 682                  if ($match[9] === '-')
 683                  {
 684                      $timezone = 0 - $timezone;
 685                  }
 686              }
 687              else
 688              {
 689                  $timezone = 0;
 690              }
 691  
 692              // Convert the number of seconds to an integer, taking decimals into account
 693              $second = round($match[6] + $match[7] / pow(10, strlen($match[7])));
 694  
 695              return gmmktime($match[4], $match[5], $second, $match[2], $match[3], $match[1]) - $timezone;
 696          }
 697          else
 698          {
 699              return false;
 700          }
 701      }
 702  
 703      /**
 704       * Remove RFC822 comments
 705       *
 706       * @access protected
 707       * @param string $data Data to strip comments from
 708       * @return string Comment stripped string
 709       */
 710  	public function remove_rfc2822_comments($string)
 711      {
 712          $string = (string) $string;
 713          $position = 0;
 714          $length = strlen($string);
 715          $depth = 0;
 716  
 717          $output = '';
 718  
 719          while ($position < $length && ($pos = strpos($string, '(', $position)) !== false)
 720          {
 721              $output .= substr($string, $position, $pos - $position);
 722              $position = $pos + 1;
 723              if ($string[$pos - 1] !== '\\')
 724              {
 725                  $depth++;
 726                  while ($depth && $position < $length)
 727                  {
 728                      $position += strcspn($string, '()', $position);
 729                      if ($string[$position - 1] === '\\')
 730                      {
 731                          $position++;
 732                          continue;
 733                      }
 734                      elseif (isset($string[$position]))
 735                      {
 736                          switch ($string[$position])
 737                          {
 738                              case '(':
 739                                  $depth++;
 740                                  break;
 741  
 742                              case ')':
 743                                  $depth--;
 744                                  break;
 745                          }
 746                          $position++;
 747                      }
 748                      else
 749                      {
 750                          break;
 751                      }
 752                  }
 753              }
 754              else
 755              {
 756                  $output .= '(';
 757              }
 758          }
 759          $output .= substr($string, $position);
 760  
 761          return $output;
 762      }
 763  
 764      /**
 765       * Parse RFC2822's date format
 766       *
 767       * @access protected
 768       * @return int Timestamp
 769       */
 770  	public function date_rfc2822($date)
 771      {
 772          static $pcre;
 773          if (!$pcre)
 774          {
 775              $wsp = '[\x09\x20]';
 776              $fws = '(?:' . $wsp . '+|' . $wsp . '*(?:\x0D\x0A' . $wsp . '+)+)';
 777              $optional_fws = $fws . '?';
 778              $day_name = $this->day_pcre;
 779              $month = $this->month_pcre;
 780              $day = '([0-9]{1,2})';
 781              $hour = $minute = $second = '([0-9]{2})';
 782              $year = '([0-9]{2,4})';
 783              $num_zone = '([+\-])([0-9]{2})([0-9]{2})';
 784              $character_zone = '([A-Z]{1,5})';
 785              $zone = '(?:' . $num_zone . '|' . $character_zone . ')';
 786              $pcre = '/(?:' . $optional_fws . $day_name . $optional_fws . ',)?' . $optional_fws . $day . $fws . $month . $fws . $year . $fws . $hour . $optional_fws . ':' . $optional_fws . $minute . '(?:' . $optional_fws . ':' . $optional_fws . $second . ')?' . $fws . $zone . '/i';
 787          }
 788          if (preg_match($pcre, $this->remove_rfc2822_comments($date), $match))
 789          {
 790              /*
 791              Capturing subpatterns:
 792              1: Day name
 793              2: Day
 794              3: Month
 795              4: Year
 796              5: Hour
 797              6: Minute
 798              7: Second
 799              8: Timezone ±
 800              9: Timezone hours
 801              10: Timezone minutes
 802              11: Alphabetic timezone
 803              */
 804  
 805              // Find the month number
 806              $month = $this->month[strtolower($match[3])];
 807  
 808              // Numeric timezone
 809              if ($match[8] !== '')
 810              {
 811                  $timezone = $match[9] * 3600;
 812                  $timezone += $match[10] * 60;
 813                  if ($match[8] === '-')
 814                  {
 815                      $timezone = 0 - $timezone;
 816                  }
 817              }
 818              // Character timezone
 819              elseif (isset($this->timezone[strtoupper($match[11])]))
 820              {
 821                  $timezone = $this->timezone[strtoupper($match[11])];
 822              }
 823              // Assume everything else to be -0000
 824              else
 825              {
 826                  $timezone = 0;
 827              }
 828  
 829              // Deal with 2/3 digit years
 830              if ($match[4] < 50)
 831              {
 832                  $match[4] += 2000;
 833              }
 834              elseif ($match[4] < 1000)
 835              {
 836                  $match[4] += 1900;
 837              }
 838  
 839              // Second is optional, if it is empty set it to zero
 840              if ($match[7] !== '')
 841              {
 842                  $second = $match[7];
 843              }
 844              else
 845              {
 846                  $second = 0;
 847              }
 848  
 849              return gmmktime($match[5], $match[6], $second, $month, $match[2], $match[4]) - $timezone;
 850          }
 851          else
 852          {
 853              return false;
 854          }
 855      }
 856  
 857      /**
 858       * Parse RFC850's date format
 859       *
 860       * @access protected
 861       * @return int Timestamp
 862       */
 863  	public function date_rfc850($date)
 864      {
 865          static $pcre;
 866          if (!$pcre)
 867          {
 868              $space = '[\x09\x20]+';
 869              $day_name = $this->day_pcre;
 870              $month = $this->month_pcre;
 871              $day = '([0-9]{1,2})';
 872              $year = $hour = $minute = $second = '([0-9]{2})';
 873              $zone = '([A-Z]{1,5})';
 874              $pcre = '/^' . $day_name . ',' . $space . $day . '-' . $month . '-' . $year . $space . $hour . ':' . $minute . ':' . $second . $space . $zone . '$/i';
 875          }
 876          if (preg_match($pcre, $date, $match))
 877          {
 878              /*
 879              Capturing subpatterns:
 880              1: Day name
 881              2: Day
 882              3: Month
 883              4: Year
 884              5: Hour
 885              6: Minute
 886              7: Second
 887              8: Timezone
 888              */
 889  
 890              // Month
 891              $month = $this->month[strtolower($match[3])];
 892  
 893              // Character timezone
 894              if (isset($this->timezone[strtoupper($match[8])]))
 895              {
 896                  $timezone = $this->timezone[strtoupper($match[8])];
 897              }
 898              // Assume everything else to be -0000
 899              else
 900              {
 901                  $timezone = 0;
 902              }
 903  
 904              // Deal with 2 digit year
 905              if ($match[4] < 50)
 906              {
 907                  $match[4] += 2000;
 908              }
 909              else
 910              {
 911                  $match[4] += 1900;
 912              }
 913  
 914              return gmmktime($match[5], $match[6], $match[7], $month, $match[2], $match[4]) - $timezone;
 915          }
 916          else
 917          {
 918              return false;
 919          }
 920      }
 921  
 922      /**
 923       * Parse C99's asctime()'s date format
 924       *
 925       * @access protected
 926       * @return int Timestamp
 927       */
 928  	public function date_asctime($date)
 929      {
 930          static $pcre;
 931          if (!$pcre)
 932          {
 933              $space = '[\x09\x20]+';
 934              $wday_name = $this->day_pcre;
 935              $mon_name = $this->month_pcre;
 936              $day = '([0-9]{1,2})';
 937              $hour = $sec = $min = '([0-9]{2})';
 938              $year = '([0-9]{4})';
 939              $terminator = '\x0A?\x00?';
 940              $pcre = '/^' . $wday_name . $space . $mon_name . $space . $day . $space . $hour . ':' . $min . ':' . $sec . $space . $year . $terminator . '$/i';
 941          }
 942          if (preg_match($pcre, $date, $match))
 943          {
 944              /*
 945              Capturing subpatterns:
 946              1: Day name
 947              2: Month
 948              3: Day
 949              4: Hour
 950              5: Minute
 951              6: Second
 952              7: Year
 953              */
 954  
 955              $month = $this->month[strtolower($match[2])];
 956              return gmmktime($match[4], $match[5], $match[6], $month, $match[3], $match[7]);
 957          }
 958          else
 959          {
 960              return false;
 961          }
 962      }
 963  
 964      /**
 965       * Parse dates using strtotime()
 966       *
 967       * @access protected
 968       * @return int Timestamp
 969       */
 970  	public function date_strtotime($date)
 971      {
 972          $strtotime = strtotime($date);
 973          if ($strtotime === -1 || $strtotime === false)
 974          {
 975              return false;
 976          }
 977          else
 978          {
 979              return $strtotime;
 980          }
 981      }
 982  }
 983