Serialize DateTime in ISO8601 format using Json.NET and ASP.NET MVC 28-12-2015 17:31:57 C# / ASP.NET MVC 0 Bookmark(s) 635 View(s) protected void Application_Start() { GlobalConfiguration.Configure(WebApiConfig.Register); var dateConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.fff'Z'" }; GlobalConfiguration.Configuration.Formatters.JsonFormatter. SerializerSettings.Converters.Add(dateConverter); }