Change Logger::setTimezone to accept a DateTimeZone object, refs #566

src/Monolog/Logger.php

@@ -443,7 +443,7 @@ class Logger implements LoggerInterface
     public function log($level, $message, array $context = array())
     {
         $level = static::toMonologLevel($level);
-        
+
         return $this->addRecord($level, $message, $context);
     }
 
@@ -618,10 +618,12 @@ class Logger implements LoggerInterface
     /**
      * Set the timezone to be used for the timestamp of log records.
      *
-     * @param string $tz Timezone name
+     * This is stored globally for all Logger instances
+     *
+     * @param \DateTimeZone $tz Timezone object
      */
-    public static function setTimezone($tz)
+    public static function setTimezone(\DateTimeZone $tz)
     {
-        self::$timezone = new \DateTimeZone($tz);
+        self::$timezone = $tz;
     }
 }