So siehts ganz gut aus !

node_modules/es5-ext/date/ensure-time-value.js

@@ -0,0 +1,10 @@
+"use strict";
+
+var safeToString = require("../safe-to-string")
+  , toInteger    = require("../number/to-integer")
+  , isTimeValue  = require("./is-time-value");
+
+module.exports = function (value) {
+	if (isTimeValue(value)) return toInteger(value);
+	throw new TypeError(safeToString(value) + " is not a valid time value");
+};