C# 获取北京时间，并修改本地时间与北京时间同步

#region GetBeijingTime
///<summary>
/// 获取标准北京时间2
///</summary>
///<returns></returns>
public static DateTime GetBeijingTime()
{
//t0 = new Date().getTime();
//nyear = 2011;
//nmonth = 7;
//nday = 5;
//nwday = 2;
//nhrs = 17;
//nmin = 12;
//nsec = 12;
DateTime dt;
WebRequest wrt = null;
WebResponse wrp = null;
try
{
wrt = WebRequest.Create("http://www.beijing-time.org/time.asp");
wrp = wrt.GetResponse();

string html = string.Empty;
using (Stream stream = wrp.GetResponseStream())
{
using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))
{
html = sr.ReadToEnd();
}
}

string[] tempArray = html.Split(';');
for (int i = 0; i < tempArray.Length; i++)
{
tempArray[i] = tempArray[i].Replace("\r\n", "");
}

string year = tempArray[1].Substring(tempArray[1].IndexOf("nyear=") + 6);
string month = tempArray[2].Substring(tempArray[2].IndexOf("nmonth=") + 7);
string day = tempArray[3].Substring(tempArray[3].IndexOf("nday=") + 5);
string hour = tempArray[5].Substring(tempArray[5].IndexOf("nhrs=") + 5);
string minite = tempArray[6].Substring(tempArray[6].IndexOf("nmin=") + 5);
string second = tempArray[7].Substring(tempArray[7].IndexOf("nsec=") + 5);
string time = String.Format("{0}-{1}-{2} {3}:{4}:{5}", year, month, day, hour, minite, second);

dt = DateTime.Parse(time);//year + "-" + month + "-" + day + "" + hour + ":" + minite + ":" + second
}
catch (WebException)
{
return DateTime.Now;
}
catch (Exception)
{
return DateTime.Now;
}
finally
{
if (wrp != null)
wrp.Close();
if (wrt != null)
wrt.Abort();
}
return dt;
}
#endregion

#region SetLocalTime
[DllImport("Kernel32.dll")]
private static extern bool SetLocalTime(ref SYSTEMTIME lpSystemTime);

[StructLayout(LayoutKind.Sequential)]
private struct SYSTEMTIME
{
public ushort wYear;
public ushort wMonth;
public ushort wDayOfWeek;
public ushort wDay;
public ushort wHour;
public ushort wMinute;
public ushort wSecond;
public ushort wMilliseconds;
}

public static void SetSystemTime(DateTime date)
{
SYSTEMTIME lpTime = new SYSTEMTIME();
lpTime.wYear = Convert.ToUInt16(date.Year);
lpTime.wMonth = Convert.ToUInt16(date.Month);
lpTime.wDayOfWeek = Convert.ToUInt16(date.DayOfWeek);
lpTime.wDay = Convert.ToUInt16(date.Day);
DateTime time = date;
lpTime.wHour = Convert.ToUInt16(time.Hour);
lpTime.wMinute = Convert.ToUInt16(time.Minute);
lpTime.wSecond = Convert.ToUInt16(time.Second);
lpTime.wMilliseconds = Convert.ToUInt16(time.Millisecond);
SetLocalTime(ref lpTime);
}
#endregion