Newtonsoft.Json设置日期格式定义

Newtonsoft.Json.Converters.IsoDateTimeConverter timeConverter = new Newtonsoft.Json.Converters.IsoDateTimeConverter();
        timeConverter.DateTimeFormat = "yyyy'-'MM'-'dd' 'HH':'mm':'ss";

        string json = Newtonsoft.Json.JsonConvert.SerializeObject(ds, timeConverter);