1 files changed, 17 insertions, 3 deletions
diff --git a/core/Date.php b/core/Date.php
index 82a3df42a6..a214751b8e 100644
--- a/core/Date.php
+++ b/core/Date.php
@@ -41,7 +41,7 @@ class Date
 
     /** The default date time string format. */
     const DATE_TIME_FORMAT = 'Y-m-d H:i:s';
-    
+
     /** Timestamp when first website came online - Tue, 06 Aug 1991 00:00:00 GMT. */
     const FIRST_WEBSITE_TIMESTAMP = 681436800;
 
@@ -155,7 +155,7 @@ class Date
             $date = new Date($dateString);
         }
         $timestamp = $date->getTimestamp();
-    
+
         if ($timestamp < self::FIRST_WEBSITE_TIMESTAMP) {
             $dateOfFirstWebsite = new self(self::FIRST_WEBSITE_TIMESTAMP);
             $message = Piwik::translate('General_ExceptionInvalidDateBeforeFirstWebsite', array(
@@ -165,7 +165,7 @@ class Date
             ));
             throw new Exception($message . ": $dateString");
         }
-        
+
         if (empty($timezone)) {
             return $date;
         }
@@ -986,6 +986,20 @@ class Date
     }
 
     /**
+     * Adds `$n` Month to `$this` date and returns the result in a new Date.
+     * instance.
+     *
+     * @param int $n Number of days to add, must be > 0.
+     * @return \Piwik\Date
+     */
+
+    public function addMonth($n)
+    {
+        $ts = strtotime("+$n month", $this->timestamp);
+        return new Date($ts, $this->timezone);
+    }
+
+    /**
      * Adds `$n` hours to `$this` date and returns the result in a new Date.
      *
      * @param int $n Number of hours to add. Can be less than 0.