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   1  <?php
   2  
   3  /**
   4   * FeedDate is an internal class that stores a date for a feed or feed item.
   5   * Usually, you won't need to use this.
   6   */
   7  class FeedDate
   8  {
   9      protected $unix;
  10  
  11      /**
  12       * Creates a new instance of FeedDate representing a given date.
  13       * Accepts RFC 822, ISO 8601 date formats as well as unix time stamps.
  14       *
  15       * @param mixed $dateString optional the date this FeedDate will represent. If not specified, the current date and
  16       *                          time is used.
  17       */
  18      public function __construct($dateString = "")
  19      {
  20          if ($dateString == "") {
  21              $dateString = date("r");
  22          }
  23  
  24          if (is_integer($dateString)) {
  25              $this->unix = $dateString;
  26  
  27              return;
  28          }
  29          $tzOffset = 0;
  30          if (preg_match(
  31              "~(?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\\s+)?(\\d{1,2})\\s+([a-zA-Z]{3})\\s+(\\d{4})\\s+(\\d{2}):(\\d{2}):(\\d{2})\\s+(.*)~",
  32              $dateString,
  33              $matches
  34          )) {
  35              $months = Array(
  36                  "Jan" => 1,
  37                  "Feb" => 2,
  38                  "Mar" => 3,
  39                  "Apr" => 4,
  40                  "May" => 5,
  41                  "Jun" => 6,
  42                  "Jul" => 7,
  43                  "Aug" => 8,
  44                  "Sep" => 9,
  45                  "Oct" => 10,
  46                  "Nov" => 11,
  47                  "Dec" => 12,
  48              );
  49              $this->unix = mktime($matches[4], $matches[5], $matches[6], $months[$matches[2]], $matches[1], $matches[3]);
  50              if (substr($matches[7], 0, 1) == '+' OR substr($matches[7], 0, 1) == '-') {
  51                  $tzOffset = (((int)substr($matches[7], 0, 3) * 60) + (int)substr($matches[7], -2)) * 60;
  52              } else {
  53                  if (strlen($matches[7]) == 1) {
  54                      $oneHour = 3600;
  55                      $ord = ord($matches[7]);
  56                      if ($ord < ord("M")) {
  57                          $tzOffset = (ord("A") - $ord - 1) * $oneHour;
  58                      } elseif ($ord >= ord("M") AND $matches[7] != "Z") {
  59                          $tzOffset = ($ord - ord("M")) * $oneHour;
  60                      } elseif ($matches[7] == "Z") {
  61                          $tzOffset = 0;
  62                      }
  63                  }
  64                  switch ($matches[7]) {
  65                      case "UT":
  66                      case "GMT":
  67                          $tzOffset = 0;
  68                  }
  69              }
  70              $this->unix += $tzOffset;
  71  
  72              return;
  73          }
  74          if (preg_match("~(\\d{4})-(\\d{2})-(\\d{2})T(\\d{2}):(\\d{2}):(\\d{2})(.*)~", $dateString, $matches)) {
  75              $this->unix = mktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]);
  76              if (substr($matches[7], 0, 1) == '+' OR substr($matches[7], 0, 1) == '-') {
  77                  $tzOffset = (((int)substr($matches[7], 0, 3) * 60) + (int)substr($matches[7], -2)) * 60;
  78              } else {
  79                  if ($matches[7] == "Z") {
  80                      $tzOffset = 0;
  81                  }
  82              }
  83              $this->unix += $tzOffset;
  84  
  85              return;
  86          }
  87          $this->unix = 0;
  88      }
  89  
  90      /**
  91       * Gets the date stored in this FeedDate as an RFC 822 date.
  92       *
  93       * @return string a date in RFC 822 format
  94       */
  95      public function rfc822()
  96      {
  97          //return gmdate("r",$this->unix);
  98          $date = gmdate("D, d M Y H:i:s O", $this->unix);
  99  
 100          return $date;
 101      }
 102  
 103      /**
 104       * Gets the date stored in this FeedDate as an ISO 8601 date.
 105       *
 106       * @return string a date in ISO 8601 format
 107       */
 108      public function iso8601()
 109      {
 110          $date = gmdate("Y-m-d\TH:i:sP", $this->unix);
 111  
 112          return $date;
 113      }
 114  
 115      /**
 116       * Gets the date stored in this FeedDate as unix time stamp.
 117       *
 118       * @return int a date as a unix time stamp
 119       */
 120      public function unix()
 121      {
 122          return $this->unix;
 123      }
 124  }