Don't pass non-string values to Date.parse (#2491)

Fixes: https://github.com/almende/vis/issues/2490

.gitignore

@@ -1,5 +1,4 @@
 # vis.js files
-dist/
 test/
 
 # npm files

README.md

@@ -1,6 +1,8 @@
 vis.js
 ==================
 
+[![Join the chat at https://gitter.im/vis-js/Lobby](https://badges.gitter.im/vis-js/Lobby.svg)](https://gitter.im/vis-js/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 <a href="https://github.com/almende/vis/issues/1781" target="_blank">
   <img align="right" src="https://raw.githubusercontent.com/almende/vis/master/misc/we_need_help.png">
 </a>
@@ -19,8 +21,22 @@ The library consists of the following components:
 - Network. Display a network (force directed graph) with nodes and edges.
 - Timeline. Display different types of data on a timeline.
 
-The vis.js library is developed by [Almende B.V](http://almende.com).
+The vis.js library was initialy developed by [Almende B.V](http://almende.com).
+
+## Badges
+
+[![NPM](https://nodei.co/npm/vis.png?downloads=true&downloadRank=true)](https://nodei.co/npm/vis/)
+
+[![Dependency Status](https://david-dm.org/almende/vis/status.svg)](https://david-dm.org/almende/vis) 
+[![devDependency Status](https://david-dm.org/almende/vis/dev-status.svg)](https://david-dm.org/almende/vis?type=dev)
+[![last version on CDNJS](https://img.shields.io/cdnjs/v/vis.svg)](https://cdnjs.com/libraries/vis)
+
+[![GitHub contributors](https://img.shields.io/github/contributors/almende/vis.svg)](https://github.com/almende/vis/graphs/contributors)
+[![GitHub stars](https://img.shields.io/github/stars/almende/vis.svg)](https://github.com/almende/vis/stargazers)
+[![GitHub issues](https://img.shields.io/github/issues/almende/vis.svg)](https://github.com/almende/vis/issues)
+[![Pending Pull-Requests](http://githubbadges.herokuapp.com/almende/vis/pulls.svg)](https://github.com/almende/vis/pulls)
 
+[![Code Climate](https://codeclimate.com/github/almende/vis/badges/gpa.svg)](https://codeclimate.com/github/almende/vis)
 
 ## Install
 

gulpfile.js

@@ -75,7 +75,7 @@ var webpackConfig = {
   cache: true,
 
   // generate details sourcempas of webpack modules
-  devtool: 'source-map'
+  //devtool: 'source-map'
 
   //debug: true,
   //bail: true

lib/util.js

@@ -409,7 +409,7 @@ exports.convert = function (object, type) {
 
     case 'number':
     case 'Number':
-      if (!isNaN(Date.parse(object))) {
+      if (exports.isString(object) && !isNaN(Date.parse(object))) {
         return moment(object).valueOf();
       } else {
         return Number(object.valueOf());

misc/we_need_help.md

@@ -13,3 +13,4 @@ If you have shown some commitment to the project you can ask [@ludost](//github.
 * [@ludost](//github.com/ludost) (almende maintainer)
 * [@mojoaxel](//github.com/mojoaxel)
 * [@yotamberk](//github.com/yotamberk)
+* [@Tooa](//github.com/Tooa)