BootstrapAdmin/Bootstrap.Admin/App_Start/WebApiConfig.cs

using System.Web.Http;

namespace Bootstrap.Admin
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services

            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            var json = GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings;
            json.DateFormatString = "yyyy'-'MM'-'dd' 'HH':'mm':'ss";
        }
    }
}