C# string to DateTime yyyy-MM-dd HH:mm:ss 毫秒输出
string dateTimeString = "2008-09-12 15:14:56.135";
DateTime time = DateTime.ParseExact(dateTimeString, "yyyy-MM-dd HH:mm:ss.fff", null);
MessageBox.Show(time.ToString("yyyy-MM-dd HH:mm:ss.fff"));
C#时间格式转换为时间戳(互转)
https://blog.youkuaiyun.com/ZFSR05255134/article/details/53066873