<?php
defined('C5_EXECUTE') or die('Access Denied.');
 
class DateHelper extends Concrete5_Helper_Date{
   /**
    * Converts a numerical timestamp to a RFC3339 timestamp
    *
    * @see http://stackoverflow.com/questions/5671433/php-time-to-google-calen...
    * @param integer $intTs - A numerical timestamp
    * @return string
    *
    * @author Brad Beebe
    * @since March 8, 2013
    */
   public function timestampToRFC3339($intTs){
      $strDate = date('Y-m-d\TH:i:s', $intTs);
 
      if(preg_match('/^([\-+])(\d{2})(\d{2})$/', date('O', $intTs), $arrMatches)){
         $strDate .= $arrMatches[1] . $arrMatches[2] . ':' . $arrMatches[3];
      }else{
         $strDate .= 'Z';
      }
 
      return $strDate;
   }
 
 
   /**
    * Converts RFC3339 timestamp to a numerical timestamp
    *
    * @param string $strTs - A RFC3339 timestamp
    * @return integer
    *
    * @author Brad Beebe
    * @since March 8, 2013
    */
   public function RFC3339toTimestamp($strTs){
      $intTs = NULL;
 
      if(preg_match('/(^[^T]+)T.([^\.]+)/', $strTs, $arrMatches)){
         if(count($arrMatches) === 3){
            $intTs = strtotime($arrMatches[1] . ' ' . $arrMatches[2]); 
         }
      }
 
      return $intTs;
   }
}
?>