c# Unix Timestamp轉換

近期專案接觸到很多API
發現目前大多數日期都是數字，查了一下是Unix Timestamp
寫了兩個Function來互轉
時間轉數字

public static double DateToDouble(DateTime? pNow = null)
{
    DateTime mNow = DateTime.Now;
    if (pNow != null && pNow.HasValue)
    {
        mNow = pNow.Value;
    }
    DateTimeOffset t = DateTimeOffset.Parse(mNow.ToString("yyyy-MM-dd HH:mm:ss"));
    return Convert.ToDouble(t.ToUnixTimeSeconds());
}

數字轉時間

  public static DateTime DoubleToDate(double? pDate = 0)
  {
      double d = 0;
      if (pDate != null && pDate.HasValue)
      {
          d = pDate.Value;
      }

      if (d > 9999999999)
          d = d / 1000;

      DateTime StartComputerFirstDay = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
      return StartComputerFirstDay.AddSeconds(d).ToLocalTime();
  }

參考資料
[C#] 時間轉換為Unix TimeStamp
Epoch (computing)
The Current Epoch Unix Timestamp