1<?php
2
3/**
4 * SimplePie
5 *
6 * A PHP-Based RSS and Atom Feed Framework.
7 * Takes the hard work out of managing a complete RSS/Atom solution.
8 *
9 * Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without modification, are
13 * permitted provided that the following conditions are met:
14 *
15 * 	* Redistributions of source code must retain the above copyright notice, this list of
16 * 	  conditions and the following disclaimer.
17 *
18 * 	* Redistributions in binary form must reproduce the above copyright notice, this list
19 * 	  of conditions and the following disclaimer in the documentation and/or other materials
20 * 	  provided with the distribution.
21 *
22 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used
23 * 	  to endorse or promote products derived from this software without specific prior
24 * 	  written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
27 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
28 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
29 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 *
36 * @package SimplePie
37 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
38 * @author Ryan Parman
39 * @author Sam 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
45namespace SimplePie\Parse;
46
47/**
48 * Date Parser
49 *
50 * @package SimplePie
51 * @subpackage Parsing
52 */
53class Date
54{
55    /**
56     * Input data
57     *
58     * @access protected
59     * @var string
60     */
61    public $date;
62
63    /**
64     * List of days, calendar day name => ordinal day number in the week
65     *
66     * @access protected
67     * @var array
68     */
69    public $day = [
70        // English
71        'mon' => 1,
72        'monday' => 1,
73        'tue' => 2,
74        'tuesday' => 2,
75        'wed' => 3,
76        'wednesday' => 3,
77        'thu' => 4,
78        'thursday' => 4,
79        'fri' => 5,
80        'friday' => 5,
81        'sat' => 6,
82        'saturday' => 6,
83        'sun' => 7,
84        'sunday' => 7,
85        // Dutch
86        'maandag' => 1,
87        'dinsdag' => 2,
88        'woensdag' => 3,
89        'donderdag' => 4,
90        'vrijdag' => 5,
91        'zaterdag' => 6,
92        'zondag' => 7,
93        // French
94        'lundi' => 1,
95        'mardi' => 2,
96        'mercredi' => 3,
97        'jeudi' => 4,
98        'vendredi' => 5,
99        'samedi' => 6,
100        'dimanche' => 7,
101        // German
102        'montag' => 1,
103        'mo' => 1,
104        'dienstag' => 2,
105        'di' => 2,
106        'mittwoch' => 3,
107        'mi' => 3,
108        'donnerstag' => 4,
109        'do' => 4,
110        'freitag' => 5,
111        'fr' => 5,
112        'samstag' => 6,
113        'sa' => 6,
114        'sonnabend' => 6,
115        // AFAIK no short form for sonnabend
116        'so' => 7,
117        'sonntag' => 7,
118        // Italian
119        'lunedì' => 1,
120        'martedì' => 2,
121        'mercoledì' => 3,
122        'giovedì' => 4,
123        'venerdì' => 5,
124        'sabato' => 6,
125        'domenica' => 7,
126        // Spanish
127        'lunes' => 1,
128        'martes' => 2,
129        'miércoles' => 3,
130        'jueves' => 4,
131        'viernes' => 5,
132        'sábado' => 6,
133        'domingo' => 7,
134        // Finnish
135        'maanantai' => 1,
136        'tiistai' => 2,
137        'keskiviikko' => 3,
138        'torstai' => 4,
139        'perjantai' => 5,
140        'lauantai' => 6,
141        'sunnuntai' => 7,
142        // Hungarian
143        'hétfő' => 1,
144        'kedd' => 2,
145        'szerda' => 3,
146        'csütörtok' => 4,
147        'péntek' => 5,
148        'szombat' => 6,
149        'vasárnap' => 7,
150        // Greek
151        'Δευ' => 1,
152        'Τρι' => 2,
153        'Τετ' => 3,
154        'Πεμ' => 4,
155        'Παρ' => 5,
156        'Σαβ' => 6,
157        'Κυρ' => 7,
158        // Russian
159        'Пн.' => 1,
160        'Вт.' => 2,
161        'Ср.' => 3,
162        'Чт.' => 4,
163        'Пт.' => 5,
164        'Сб.' => 6,
165        'Вс.' => 7,
166    ];
167
168    /**
169     * List of months, calendar month name => calendar month number
170     *
171     * @access protected
172     * @var array
173     */
174    public $month = [
175        // English
176        'jan' => 1,
177        'january' => 1,
178        'feb' => 2,
179        'february' => 2,
180        'mar' => 3,
181        'march' => 3,
182        'apr' => 4,
183        'april' => 4,
184        'may' => 5,
185        // No long form of May
186        'jun' => 6,
187        'june' => 6,
188        'jul' => 7,
189        'july' => 7,
190        'aug' => 8,
191        'august' => 8,
192        'sep' => 9,
193        'september' => 9,
194        'oct' => 10,
195        'october' => 10,
196        'nov' => 11,
197        'november' => 11,
198        'dec' => 12,
199        'december' => 12,
200        // Dutch
201        'januari' => 1,
202        'februari' => 2,
203        'maart' => 3,
204        'april' => 4,
205        'mei' => 5,
206        'juni' => 6,
207        'juli' => 7,
208        'augustus' => 8,
209        'september' => 9,
210        'oktober' => 10,
211        'november' => 11,
212        'december' => 12,
213        // French
214        'janvier' => 1,
215        'février' => 2,
216        'mars' => 3,
217        'avril' => 4,
218        'mai' => 5,
219        'juin' => 6,
220        'juillet' => 7,
221        'août' => 8,
222        'septembre' => 9,
223        'octobre' => 10,
224        'novembre' => 11,
225        'décembre' => 12,
226        // German
227        'januar' => 1,
228        'jan' => 1,
229        'februar' => 2,
230        'feb' => 2,
231        'märz' => 3,
232        'mär' => 3,
233        'april' => 4,
234        'apr' => 4,
235        'mai' => 5, // no short form for may
236        'juni' => 6,
237        'jun' => 6,
238        'juli' => 7,
239        'jul' => 7,
240        'august' => 8,
241        'aug' => 8,
242        'september' => 9,
243        'sep' => 9,
244        'oktober' => 10,
245        'okt' => 10,
246        'november' => 11,
247        'nov' => 11,
248        'dezember' => 12,
249        'dez' => 12,
250        // Italian
251        'gennaio' => 1,
252        'febbraio' => 2,
253        'marzo' => 3,
254        'aprile' => 4,
255        'maggio' => 5,
256        'giugno' => 6,
257        'luglio' => 7,
258        'agosto' => 8,
259        'settembre' => 9,
260        'ottobre' => 10,
261        'novembre' => 11,
262        'dicembre' => 12,
263        // Spanish
264        'enero' => 1,
265        'febrero' => 2,
266        'marzo' => 3,
267        'abril' => 4,
268        'mayo' => 5,
269        'junio' => 6,
270        'julio' => 7,
271        'agosto' => 8,
272        'septiembre' => 9,
273        'setiembre' => 9,
274        'octubre' => 10,
275        'noviembre' => 11,
276        'diciembre' => 12,
277        // Finnish
278        'tammikuu' => 1,
279        'helmikuu' => 2,
280        'maaliskuu' => 3,
281        'huhtikuu' => 4,
282        'toukokuu' => 5,
283        'kesäkuu' => 6,
284        'heinäkuu' => 7,
285        'elokuu' => 8,
286        'suuskuu' => 9,
287        'lokakuu' => 10,
288        'marras' => 11,
289        'joulukuu' => 12,
290        // Hungarian
291        'január' => 1,
292        'február' => 2,
293        'március' => 3,
294        'április' => 4,
295        'május' => 5,
296        'június' => 6,
297        'július' => 7,
298        'augusztus' => 8,
299        'szeptember' => 9,
300        'október' => 10,
301        'november' => 11,
302        'december' => 12,
303        // Greek
304        'Ιαν' => 1,
305        'Φεβ' => 2,
306        'Μάώ' => 3,
307        'Μαώ' => 3,
308        'Απρ' => 4,
309        'Μάι' => 5,
310        'Μαϊ' => 5,
311        'Μαι' => 5,
312        'Ιούν' => 6,
313        'Ιον' => 6,
314        'Ιούλ' => 7,
315        'Ιολ' => 7,
316        'Αύγ' => 8,
317        'Αυγ' => 8,
318        'Σεπ' => 9,
319        'Οκτ' => 10,
320        'Νοέ' => 11,
321        'Δεκ' => 12,
322        // Russian
323        'Янв' => 1,
324        'января' => 1,
325        'Фев' => 2,
326        'февраля' => 2,
327        'Мар' => 3,
328        'марта' => 3,
329        'Апр' => 4,
330        'апреля' => 4,
331        'Май' => 5,
332        'мая' => 5,
333        'Июн' => 6,
334        'июня' => 6,
335        'Июл' => 7,
336        'июля' => 7,
337        'Авг' => 8,
338        'августа' => 8,
339        'Сен' => 9,
340        'сентября' => 9,
341        'Окт' => 10,
342        'октября' => 10,
343        'Ноя' => 11,
344        'ноября' => 11,
345        'Дек' => 12,
346        'декабря' => 12,
347
348    ];
349
350    /**
351     * List of timezones, abbreviation => offset from UTC
352     *
353     * @access protected
354     * @var array
355     */
356    public $timezone = [
357        'ACDT' => 37800,
358        'ACIT' => 28800,
359        'ACST' => 34200,
360        'ACT' => -18000,
361        'ACWDT' => 35100,
362        'ACWST' => 31500,
363        'AEDT' => 39600,
364        'AEST' => 36000,
365        'AFT' => 16200,
366        'AKDT' => -28800,
367        'AKST' => -32400,
368        'AMDT' => 18000,
369        'AMT' => -14400,
370        'ANAST' => 46800,
371        'ANAT' => 43200,
372        'ART' => -10800,
373        'AZOST' => -3600,
374        'AZST' => 18000,
375        'AZT' => 14400,
376        'BIOT' => 21600,
377        'BIT' => -43200,
378        'BOT' => -14400,
379        'BRST' => -7200,
380        'BRT' => -10800,
381        'BST' => 3600,
382        'BTT' => 21600,
383        'CAST' => 18000,
384        'CAT' => 7200,
385        'CCT' => 23400,
386        'CDT' => -18000,
387        'CEDT' => 7200,
388        'CEST' => 7200,
389        'CET' => 3600,
390        'CGST' => -7200,
391        'CGT' => -10800,
392        'CHADT' => 49500,
393        'CHAST' => 45900,
394        'CIST' => -28800,
395        'CKT' => -36000,
396        'CLDT' => -10800,
397        'CLST' => -14400,
398        'COT' => -18000,
399        'CST' => -21600,
400        'CVT' => -3600,
401        'CXT' => 25200,
402        'DAVT' => 25200,
403        'DTAT' => 36000,
404        'EADT' => -18000,
405        'EAST' => -21600,
406        'EAT' => 10800,
407        'ECT' => -18000,
408        'EDT' => -14400,
409        'EEST' => 10800,
410        'EET' => 7200,
411        'EGT' => -3600,
412        'EKST' => 21600,
413        'EST' => -18000,
414        'FJT' => 43200,
415        'FKDT' => -10800,
416        'FKST' => -14400,
417        'FNT' => -7200,
418        'GALT' => -21600,
419        'GEDT' => 14400,
420        'GEST' => 10800,
421        'GFT' => -10800,
422        'GILT' => 43200,
423        'GIT' => -32400,
424        'GST' => 14400,
425        'GST' => -7200,
426        'GYT' => -14400,
427        'HAA' => -10800,
428        'HAC' => -18000,
429        'HADT' => -32400,
430        'HAE' => -14400,
431        'HAP' => -25200,
432        'HAR' => -21600,
433        'HAST' => -36000,
434        'HAT' => -9000,
435        'HAY' => -28800,
436        'HKST' => 28800,
437        'HMT' => 18000,
438        'HNA' => -14400,
439        'HNC' => -21600,
440        'HNE' => -18000,
441        'HNP' => -28800,
442        'HNR' => -25200,
443        'HNT' => -12600,
444        'HNY' => -32400,
445        'IRDT' => 16200,
446        'IRKST' => 32400,
447        'IRKT' => 28800,
448        'IRST' => 12600,
449        'JFDT' => -10800,
450        'JFST' => -14400,
451        'JST' => 32400,
452        'KGST' => 21600,
453        'KGT' => 18000,
454        'KOST' => 39600,
455        'KOVST' => 28800,
456        'KOVT' => 25200,
457        'KRAST' => 28800,
458        'KRAT' => 25200,
459        'KST' => 32400,
460        'LHDT' => 39600,
461        'LHST' => 37800,
462        'LINT' => 50400,
463        'LKT' => 21600,
464        'MAGST' => 43200,
465        'MAGT' => 39600,
466        'MAWT' => 21600,
467        'MDT' => -21600,
468        'MESZ' => 7200,
469        'MEZ' => 3600,
470        'MHT' => 43200,
471        'MIT' => -34200,
472        'MNST' => 32400,
473        'MSDT' => 14400,
474        'MSST' => 10800,
475        'MST' => -25200,
476        'MUT' => 14400,
477        'MVT' => 18000,
478        'MYT' => 28800,
479        'NCT' => 39600,
480        'NDT' => -9000,
481        'NFT' => 41400,
482        'NMIT' => 36000,
483        'NOVST' => 25200,
484        'NOVT' => 21600,
485        'NPT' => 20700,
486        'NRT' => 43200,
487        'NST' => -12600,
488        'NUT' => -39600,
489        'NZDT' => 46800,
490        'NZST' => 43200,
491        'OMSST' => 25200,
492        'OMST' => 21600,
493        'PDT' => -25200,
494        'PET' => -18000,
495        'PETST' => 46800,
496        'PETT' => 43200,
497        'PGT' => 36000,
498        'PHOT' => 46800,
499        'PHT' => 28800,
500        'PKT' => 18000,
501        'PMDT' => -7200,
502        'PMST' => -10800,
503        'PONT' => 39600,
504        'PST' => -28800,
505        'PWT' => 32400,
506        'PYST' => -10800,
507        'PYT' => -14400,
508        'RET' => 14400,
509        'ROTT' => -10800,
510        'SAMST' => 18000,
511        'SAMT' => 14400,
512        'SAST' => 7200,
513        'SBT' => 39600,
514        'SCDT' => 46800,
515        'SCST' => 43200,
516        'SCT' => 14400,
517        'SEST' => 3600,
518        'SGT' => 28800,
519        'SIT' => 28800,
520        'SRT' => -10800,
521        'SST' => -39600,
522        'SYST' => 10800,
523        'SYT' => 7200,
524        'TFT' => 18000,
525        'THAT' => -36000,
526        'TJT' => 18000,
527        'TKT' => -36000,
528        'TMT' => 18000,
529        'TOT' => 46800,
530        'TPT' => 32400,
531        'TRUT' => 36000,
532        'TVT' => 43200,
533        'TWT' => 28800,
534        'UYST' => -7200,
535        'UYT' => -10800,
536        'UZT' => 18000,
537        'VET' => -14400,
538        'VLAST' => 39600,
539        'VLAT' => 36000,
540        'VOST' => 21600,
541        'VUT' => 39600,
542        'WAST' => 7200,
543        'WAT' => 3600,
544        'WDT' => 32400,
545        'WEST' => 3600,
546        'WFT' => 43200,
547        'WIB' => 25200,
548        'WIT' => 32400,
549        'WITA' => 28800,
550        'WKST' => 18000,
551        'WST' => 28800,
552        'YAKST' => 36000,
553        'YAKT' => 32400,
554        'YAPT' => 36000,
555        'YEKST' => 21600,
556        'YEKT' => 18000,
557    ];
558
559    /**
560     * Cached PCRE for Date::$day
561     *
562     * @access protected
563     * @var string
564     */
565    public $day_pcre;
566
567    /**
568     * Cached PCRE for Date::$month
569     *
570     * @access protected
571     * @var string
572     */
573    public $month_pcre;
574
575    /**
576     * Array of user-added callback methods
577     *
578     * @access private
579     * @var array
580     */
581    public $built_in = [];
582
583    /**
584     * Array of user-added callback methods
585     *
586     * @access private
587     * @var array
588     */
589    public $user = [];
590
591    /**
592     * Create new Date object, and set self::day_pcre,
593     * self::month_pcre, and self::built_in
594     *
595     * @access private
596     */
597    public function __construct()
598    {
599        $this->day_pcre = '(' . implode('|', array_keys($this->day)) . ')';
600        $this->month_pcre = '(' . implode('|', array_keys($this->month)) . ')';
601
602        static $cache;
603        if (!isset($cache[get_class($this)])) {
604            $all_methods = get_class_methods($this);
605
606            foreach ($all_methods as $method) {
607                if (strtolower(substr($method, 0, 5)) === 'date_') {
608                    $cache[get_class($this)][] = $method;
609                }
610            }
611        }
612
613        foreach ($cache[get_class($this)] as $method) {
614            $this->built_in[] = $method;
615        }
616    }
617
618    /**
619     * Get the object
620     *
621     * @access public
622     */
623    public static function get()
624    {
625        static $object;
626        if (!$object) {
627            $object = new Date();
628        }
629        return $object;
630    }
631
632    /**
633     * Parse a date
634     *
635     * @final
636     * @access public
637     * @param string $date Date to parse
638     * @return int Timestamp corresponding to date string, or false on failure
639     */
640    public function parse($date)
641    {
642        foreach ($this->user as $method) {
643            if (($returned = call_user_func($method, $date)) !== false) {
644                return $returned;
645            }
646        }
647
648        foreach ($this->built_in as $method) {
649            if (($returned = call_user_func([$this, $method], $date)) !== false) {
650                return $returned;
651            }
652        }
653
654        return false;
655    }
656
657    /**
658     * Add a callback method to parse a date
659     *
660     * @final
661     * @access public
662     * @param callable $callback
663     */
664    public function add_callback($callback)
665    {
666        if (is_callable($callback)) {
667            $this->user[] = $callback;
668        } else {
669            trigger_error('User-supplied function must be a valid callback', E_USER_WARNING);
670        }
671    }
672
673    /**
674     * Parse a superset of W3C-DTF (allows hyphens and colons to be omitted, as
675     * well as allowing any of upper or lower case "T", horizontal tabs, or
676     * spaces to be used as the time separator (including more than one))
677     *
678     * @access protected
679     * @return int Timestamp
680     */
681    public function date_w3cdtf($date)
682    {
683        $pcre = <<<'PCRE'
684            /
685            ^
686            (?P<year>[0-9]{4})
687            (?:
688                -?
689                (?P<month>[0-9]{2})
690                (?:
691                    -?
692                    (?P<day>[0-9]{2})
693                    (?:
694                        [Tt\x09\x20]+
695                        (?P<hour>[0-9]{2})
696                        (?:
697                            :?
698                            (?P<minute>[0-9]{2})
699                            (?:
700                                :?
701                                (?P<second>[0-9]{2})
702                                (?:
703                                    .
704                                    (?P<second_fraction>[0-9]*)
705                                )?
706                            )?
707                        )?
708                        (?:
709                            (?P<zulu>Z)
710                            |   (?P<tz_sign>[+\-])
711                                (?P<tz_hour>[0-9]{1,2})
712                                :?
713                                (?P<tz_minute>[0-9]{1,2})
714                        )
715                    )?
716                )?
717            )?
718            $
719            /x
720PCRE;
721        if (preg_match($pcre, $date, $match)) {
722            // Fill in empty matches and convert to proper types.
723            $year = (int) $match['year'];
724            $month = isset($match['month']) ? (int) $match['month'] : 1;
725            $day = isset($match['day']) ? (int) $match['day'] : 1;
726            $hour = isset($match['hour']) ? (int) $match['hour'] : 0;
727            $minute = isset($match['minute']) ? (int) $match['minute'] : 0;
728            $second = isset($match['second']) ? (int) $match['second'] : 0;
729            $second_fraction = isset($match['second_fraction']) ? ((int) $match['second_fraction']) / (10 ** strlen($match['second_fraction'])) : 0;
730            $tz_sign = ($match['tz_sign'] ?? '') === '-' ? -1 : 1;
731            $tz_hour = isset($match['tz_hour']) ? (int) $match['tz_hour'] : 0;
732            $tz_minute = isset($match['tz_minute']) ? (int) $match['tz_minute'] : 0;
733
734            // Numeric timezone
735            $timezone = $tz_hour * 3600;
736            $timezone += $tz_minute * 60;
737            $timezone *= $tz_sign;
738
739            // Convert the number of seconds to an integer, taking decimals into account
740            $second = (int) round($second + $second_fraction);
741
742            return gmmktime($hour, $minute, $second, $month, $day, $year) - $timezone;
743        }
744
745        return false;
746    }
747
748    /**
749     * Remove RFC822 comments
750     *
751     * @access protected
752     * @param string $data Data to strip comments from
753     * @return string Comment stripped string
754     */
755    public function remove_rfc2822_comments($string)
756    {
757        $string = (string) $string;
758        $position = 0;
759        $length = strlen($string);
760        $depth = 0;
761
762        $output = '';
763
764        while ($position < $length && ($pos = strpos($string, '(', $position)) !== false) {
765            $output .= substr($string, $position, $pos - $position);
766            $position = $pos + 1;
767            if ($pos === 0 || $string[$pos - 1] !== '\\') {
768                $depth++;
769                while ($depth && $position < $length) {
770                    $position += strcspn($string, '()', $position);
771                    if ($string[$position - 1] === '\\') {
772                        $position++;
773                        continue;
774                    } elseif (isset($string[$position])) {
775                        switch ($string[$position]) {
776                            case '(':
777                                $depth++;
778                                break;
779
780                            case ')':
781                                $depth--;
782                                break;
783                        }
784                        $position++;
785                    } else {
786                        break;
787                    }
788                }
789            } else {
790                $output .= '(';
791            }
792        }
793        $output .= substr($string, $position);
794
795        return $output;
796    }
797
798    /**
799     * Parse RFC2822's date format
800     *
801     * @access protected
802     * @return int Timestamp
803     */
804    public function date_rfc2822($date)
805    {
806        static $pcre;
807        if (!$pcre) {
808            $wsp = '[\x09\x20]';
809            $fws = '(?:' . $wsp . '+|' . $wsp . '*(?:\x0D\x0A' . $wsp . '+)+)';
810            $optional_fws = $fws . '?';
811            $day_name = $this->day_pcre;
812            $month = $this->month_pcre;
813            $day = '([0-9]{1,2})';
814            $hour = $minute = $second = '([0-9]{2})';
815            $year = '([0-9]{2,4})';
816            $num_zone = '([+\-])([0-9]{2})([0-9]{2})';
817            $character_zone = '([A-Z]{1,5})';
818            $zone = '(?:' . $num_zone . '|' . $character_zone . ')';
819            $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 . $zone . '/i';
820        }
821        if (preg_match($pcre, $this->remove_rfc2822_comments($date), $match)) {
822            /*
823            Capturing subpatterns:
824            1: Day name
825            2: Day
826            3: Month
827            4: Year
828            5: Hour
829            6: Minute
830            7: Second
831            8: Timezone ±
832            9: Timezone hours
833            10: Timezone minutes
834            11: Alphabetic timezone
835            */
836
837            // Find the month number
838            $month = $this->month[strtolower($match[3])];
839
840            // Numeric timezone
841            if ($match[8] !== '') {
842                $timezone = $match[9] * 3600;
843                $timezone += $match[10] * 60;
844                if ($match[8] === '-') {
845                    $timezone = 0 - $timezone;
846                }
847            }
848            // Character timezone
849            elseif (isset($this->timezone[strtoupper($match[11])])) {
850                $timezone = $this->timezone[strtoupper($match[11])];
851            }
852            // Assume everything else to be -0000
853            else {
854                $timezone = 0;
855            }
856
857            // Deal with 2/3 digit years
858            if ($match[4] < 50) {
859                $match[4] += 2000;
860            } elseif ($match[4] < 1000) {
861                $match[4] += 1900;
862            }
863
864            // Second is optional, if it is empty set it to zero
865            if ($match[7] !== '') {
866                $second = $match[7];
867            } else {
868                $second = 0;
869            }
870
871            return gmmktime(intval($match[5]), intval($match[6]), intval($second), intval($month), intval($match[2]), intval($match[4])) - $timezone;
872        }
873
874        return false;
875    }
876
877    /**
878     * Parse RFC850's date format
879     *
880     * @access protected
881     * @return int Timestamp
882     */
883    public function date_rfc850($date)
884    {
885        static $pcre;
886        if (!$pcre) {
887            $space = '[\x09\x20]+';
888            $day_name = $this->day_pcre;
889            $month = $this->month_pcre;
890            $day = '([0-9]{1,2})';
891            $year = $hour = $minute = $second = '([0-9]{2})';
892            $zone = '([A-Z]{1,5})';
893            $pcre = '/^' . $day_name . ',' . $space . $day . '-' . $month . '-' . $year . $space . $hour . ':' . $minute . ':' . $second . $space . $zone . '$/i';
894        }
895        if (preg_match($pcre, $date, $match)) {
896            /*
897            Capturing subpatterns:
898            1: Day name
899            2: Day
900            3: Month
901            4: Year
902            5: Hour
903            6: Minute
904            7: Second
905            8: Timezone
906            */
907
908            // Month
909            $month = $this->month[strtolower($match[3])];
910
911            // Character timezone
912            if (isset($this->timezone[strtoupper($match[8])])) {
913                $timezone = $this->timezone[strtoupper($match[8])];
914            }
915            // Assume everything else to be -0000
916            else {
917                $timezone = 0;
918            }
919
920            // Deal with 2 digit year
921            if ($match[4] < 50) {
922                $match[4] += 2000;
923            } else {
924                $match[4] += 1900;
925            }
926
927            return gmmktime($match[5], $match[6], $match[7], $month, $match[2], $match[4]) - $timezone;
928        }
929
930        return false;
931    }
932
933    /**
934     * Parse C99's asctime()'s date format
935     *
936     * @access protected
937     * @return int Timestamp
938     */
939    public function date_asctime($date)
940    {
941        static $pcre;
942        if (!$pcre) {
943            $space = '[\x09\x20]+';
944            $wday_name = $this->day_pcre;
945            $mon_name = $this->month_pcre;
946            $day = '([0-9]{1,2})';
947            $hour = $sec = $min = '([0-9]{2})';
948            $year = '([0-9]{4})';
949            $terminator = '\x0A?\x00?';
950            $pcre = '/^' . $wday_name . $space . $mon_name . $space . $day . $space . $hour . ':' . $min . ':' . $sec . $space . $year . $terminator . '$/i';
951        }
952        if (preg_match($pcre, $date, $match)) {
953            /*
954            Capturing subpatterns:
955            1: Day name
956            2: Month
957            3: Day
958            4: Hour
959            5: Minute
960            6: Second
961            7: Year
962            */
963
964            $month = $this->month[strtolower($match[2])];
965            return gmmktime((int) $match[4], (int) $match[5], (int) $match[6], $month, (int) $match[3], (int) $match[7]);
966        }
967
968        return false;
969    }
970
971    /**
972     * Parse dates using strtotime()
973     *
974     * @access protected
975     * @return int Timestamp
976     */
977    public function date_strtotime($date)
978    {
979        $strtotime = strtotime($date);
980        if ($strtotime === -1 || $strtotime === false) {
981            return false;
982        }
983
984        return $strtotime;
985    }
986}
987
988class_alias('SimplePie\Parse\Date', 'SimplePie_Parse_Date');
989