我可能遗漏了一些东西，但是在创建序列化程序时尝试在设置中传递所需的日期和时间格式:

I might be missing something, but try passing the desired date and time format in the settings when creating the serializer:

var serializer = new DataContractJsonSerializer(
    typeof(Client),
    new DataContractJsonSerializerSettings {
        DateTimeFormat = new DateTimeFormat("yyyy-MM-dd hh:mm:ss"),
    });