diff --git a/lib/console2.js b/lib/console2.js
index 87f4fef..ff2a4db 100644
--- a/lib/console2.js
+++ b/lib/console2.js
@@ -23,7 +23,7 @@
      * @return {String}                  timestamp to String
      */
     var buildTime = function (timestamp) {
-        return (new Date(timestamp)).toString() + " ";
+        return (new Date(timestamp)).toISOString() + " ";
     };
 
     /**
@@ -148,7 +148,7 @@
      * Console2.prototype.tag
      *
      * Add tags
-     * @param  {String} tag 
+     * @param  {*} tag 
      */
     Console2.prototype.tag = Console2.prototype.t = function () {
         var tags = Array.prototype.slice.call(arguments, 0);