问如何在C#中获取今天上午9点的太平洋标准时间纪元

EN

  TimeSpan test = DateTime.Now - new DateTime(1970, 01, 01);
  MessageBox.Show(test.TotalSeconds.ToString());

 MessageBox.Show((DateTime.Now - new DateTime(1970, 01, 01))
     .TotalSeconds.ToString());

var zone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
var utcNow = DateTime.UtcNow;
var pacificNow = TimeZoneInfo.ConvertTimeFromUtc(utcNow, zone);
MessageBox.Show((pacificNow  - new DateTime(1970, 01, 01))
     .TotalSeconds.ToString());

    TimeZoneInfo destTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
    int timeZoneDiffSeconds = (int) destTimeZone.BaseUtcOffset.Subtract(TimeZoneInfo.Local.BaseUtcOffset).TotalSeconds;

    DateTime todayLocal9Am = DateTime.Today.Date + new TimeSpan(9, 0, 0);

    Int32 unix9AmLocalTime = (Int32) (todayLocal9Am.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
    Int32 unix9AmPstTime = unix9AmLocalTime - Math.Abs(timeZoneDiffSeconds);

    Console.WriteLine(unix9AmPstTime);

    Console.Read();