JSGrid DateTime Filtering

HTML

<link rel="stylesheet" href="http://js-grid.com/css/jsgrid.min.css">
<link rel="stylesheet" href="http://js-grid.com/css/jsgrid-theme.min.css">
<script src="http://js-grid.com/js/jsgrid.min.js"></script>
<script src="http://underscorejs.org/underscore-min.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.10.4/themes/redmond/jquery-ui.css">
<script src="https://code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<div id="jsGrid"></div>

CSS

html,
body {
    height: 100%;    
}

JavaScript

var db = {

    loadData: function(filter) {
        return $.grep(this.users, function(user) {
            return (!filter.Name || user.Name.indexOf(filter.Name) > -1) 
                && (!filter.RegisterDate.from || new Date(user.RegisterDate) >= filter.RegisterDate.from) 
                && (!filter.RegisterDate.to || new Date(user.RegisterDate) <= filter.RegisterDate.to)
            
        });
    },
    
    insertItem: function(item) {
        this.users.push(item);
    },
    
    deleteItem: function(item) {
        var index = $.inArray(item, this.users);
        this.users.splice(index, 1);
    }
    
};

window.db = db;

db.users = [
    {
        "ID": "x",
        "Account": "A758A693-0302-03D1-AE53-EEFE22855556",
        "Name": "Carson Kelley",
        "RegisterDate": "2002-04-20T22:55:52-07:00"
    },
    {
        "Account": "D89FF524-1233-0CE7-C9E1-56EFF017A321",
        "Name": "Prescott Griffin",
        "RegisterDate": "2011-02-22T05:59:55-08:00"
    },
    {
        "Account": "06FAAD9A-5114-08F6-D60C-961B2528B4F0",
        "Name": "Amir Saunders",
        "RegisterDate": "2014-08-13T09:17:49-07:00"
    },
    {
        "Account": "EED7653D-7DD9-A722-64A8-36A55ECDBE77",
        "Name": "Derek Thornton",
        "RegisterDate": "2012-02-27T01:31:07-08:00"
    },
    {
        "Account": "2A2E6D40-FEBD-C643-A751-9AB4CAF1E2F6",
        "Name": "Fletcher Romero",
        "RegisterDate": "2010-06-25T15:49:54-07:00"
    },
    {
        "Account": "3978F8FA-DFF0-DA0E-0A5D-EB9D281A3286",
        "Name": "Thaddeus Stein",
        "RegisterDate": "2013-11-10T07:29:41-08:00"
    },
    {
        "Account": "658DBF5A-176E-569A-9273-74FB5F69FA42",
        "Name": "Nash Knapp",
        "RegisterDate": "2005-06-24T09:11:19-07:00"
    },
    {
        "Account": "76D2EE4B-7A73-1212-F6F2-957EF8C1F907",
        "Name": "Quamar Vega",
        "RegisterDate": "2011-04-13T20:06:29-07:00"
    },
    {
        "Account":...