.Net Core 给WebApi接口返回值添加全局的日期格式化

 public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc().AddJsonOptions(options => {
                options.SerializerSettings.DateFormatString = "yyyy-MM-dd HH:mm:ss";
                options.SerializerSettings.ContractResolver = new DefaultContractResolver();
            });
        }