C#将时间戳与DateTime互转

时间戳转时间

​```C#
 private void getTimeByMillsSpan()
        {
            string createTime = "1654591477438";//时间毫秒差
            double timeVal = double.Parse(createTime);//字符串转为double，进行运算
            DateTime t = Convert.ToDateTime(DateTime.Parse(DateTime.Now.ToString("1970-01-01 08:00:00")).AddMilliseconds(timeVal).ToString());//返回为时间格式
           
            MessageBox.Show(t.ToString());

            //richTextBox1.Text += t.ToString();
        }
​```

时间转时间戳

        public static string TimeStamp(DateTime dateTime)
        {
            return ((dateTime.ToUniversalTime().Ticks - 621355968000000000) / 10000000).ToString(Constants.CurrentCultureInfo);
        }