month is an optional argument to the Date.UTC function
For confirmation see
@@ -1350,7 +1350,7 @@ Date.parse = function(date) {};
/**
* @param {number} year
- * @param {number} month
+ * @param {number=} opt_month
* @param {number=} opt_date
* @param {number=} opt_hours
* @param {number=} opt_minute
@@ -1360,7 +1360,7 @@ Date.parse = function(date) {};
* @nosideeffects
* @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/UTC
*/
-Date.UTC = function(year, month,
+Date.UTC = function(year, opt_month,
opt_date, opt_hours, opt_minute, opt_second, opt_ms) {};
/**
