Date::date_rfc2822( $date ): int

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 name825            2: Day826            3: Month827            4: Year828            5: Hour829            6: Minute830            7: Second831            8: Timezone ±832            9: Timezone hours833            10: Timezone minutes834            11: Alphabetic timezone835            */836 837            // Find the month number838            $month = $this->month[strtolower($match[3])];839 840            // Numeric timezone841            if ($match[8] !== '') {842                $timezone = $match[9] * 3600;843                $timezone += $match[10] * 60;844                if ($match[8] === '-') {845                    $timezone = 0 - $timezone;846                }847            }848            // Character timezone849            elseif (isset($this->timezone[strtoupper($match[11])])) {850                $timezone = $this->timezone[strtoupper($match[11])];851            }852            // Assume everything else to be -0000853            else {854                $timezone = 0;855            }856 857            // Deal with 2/3 digit years858            if ($match[4] < 50) {859                $match[4] += 2000;860            } elseif ($match[4] < 1000) {861                $match[4] += 1900;862            }863 864            // Second is optional, if it is empty set it to zero865            if ($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    }