From bf4dd6a94d64eabd6e9be6703f7dc0fcb1c4a6eb Mon Sep 17 00:00:00 2001
From: mjjo <mjjo53@gmail.com>
Date: Thu, 21 Jul 2016 00:25:01 +0900
Subject: [PATCH] =?UTF-8?q?=EC=9D=B8=ED=84=B0=EB=84=B7=20=EC=8B=9C?=
 =?UTF-8?q?=EA=B0=84=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 MainForm.cs |   3 +-
 UlUtil.cs   | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 110 insertions(+), 3 deletions(-)

diff --git a/MainForm.cs b/MainForm.cs
index 8f497b6..0438468 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -37,6 +37,7 @@ namespace upper_limit_crawler
 			SetDoubleBuffered(tbLog);
 
 			UlUtil.Init(tbLog);
+			//UlUtil.GetServerTime();
 
 			btApply_Click(null, null);
 
@@ -67,7 +68,7 @@ namespace upper_limit_crawler
 
         private bool IsOnTime()
 		{
-			DateTime CurTime = DateTime.Now;
+			DateTime CurTime = UlUtil.GetCurTime();
 			if (CurTime.DayOfWeek == DayOfWeek.Sunday || CurTime.DayOfWeek == DayOfWeek.Saturday)
 				return false;
 
diff --git a/UlUtil.cs b/UlUtil.cs
index 761d430..92c756a 100644
--- a/UlUtil.cs
+++ b/UlUtil.cs
@@ -17,22 +17,128 @@ namespace upper_limit_crawler
 		static CPUTILLib.CpCybos m_Util = new CPUTILLib.CpCybos();
 		static TextBox m_tbLog = null;
 		static string m_strLogFileName;
+		static TimeSpan m_TimeDiff = TimeSpan.Zero;
 
 		public static void Init(TextBox tbLog)
 		{
 			m_tbLog = tbLog;
 
+			DateTime time = GetFastestNISTDate();
+			m_TimeDiff = time - DateTime.Now;
+
 			if (Debugger.IsAttached == true)
 				m_strLogFileName = Directory.GetParent(Environment.CurrentDirectory).Parent.FullName+"\\";
 			m_strLogFileName += "log\\";
 			if (Directory.Exists(m_strLogFileName) == false)
 				Directory.CreateDirectory(m_strLogFileName);
-			m_strLogFileName += "log-" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
+			m_strLogFileName += "log-" + GetCurTime().ToString("yyyy-MM-dd") + ".txt";
+		}
+
+		public static DateTime GetCurTime()
+		{
+			return DateTime.Now + m_TimeDiff;
+		}
+
+		public static void GetServerTime()
+		{
+			try
+			{
+				string strURL = string.Format("http://www.timeapi.org/utc/now?format={0}", (@"\Y-\m-\d \H:\M:\S"));
+				Uri uri = new Uri(strURL);
+				WebRequest wReq = (HttpWebRequest)WebRequest.Create(uri); // WebRequest 객체 형성 및 HttpWebRequest 로 형변환
+				wReq.Method = "GET"; // 전송 방법 "GET" or "POST"
+
+				using (HttpWebResponse wRes = (HttpWebResponse)wReq.GetResponse())
+				{
+					Stream respPostStream = wRes.GetResponseStream();
+					StreamReader readerPost = new StreamReader(respPostStream, Encoding.GetEncoding("EUC-KR"), true);
+
+					string resResult = readerPost.ReadToEnd();
+				}
+			}
+			catch (WebException ex)
+			{
+				if (ex.Status == WebExceptionStatus.ProtocolError && ex.Response != null)
+				{
+					var resp = (HttpWebResponse)ex.Response;
+					Trace(string.Format("인터넷 시간 동기화 실패 ({0})", resp.StatusCode));
+				}
+			}
+		}
+
+		public static DateTime GetFastestNISTDate()
+		{
+			var result = DateTime.MinValue;
+			// Initialize the list of NIST time servers
+			// http://tf.nist.gov/tf-cgi/servers.cgi
+			string[] servers = new string[] {
+				"time-c.nist.gov",
+				"nist1-macon.macon.ga.us",
+				"time.nist.gov",
+				"time-nw.nist.gov",
+				"nist-time-server.eoni.com"
+			};
+
+			// Try 5 servers in random order to spread the load
+			Random rnd = new Random();
+			foreach (string server in servers.OrderBy(s => rnd.NextDouble()).Take(5))
+			{
+				try
+				{
+					// Connect to the server (at port 13) and get the response
+					string serverResponse = string.Empty;
+					using (var reader = new StreamReader(new System.Net.Sockets.TcpClient(server, 13).GetStream()))
+					{
+						serverResponse = reader.ReadToEnd();
+					}
+
+					// If a response was received
+					if (!string.IsNullOrEmpty(serverResponse))
+					{
+						// Split the response string ("55596 11-02-14 13:54:11 00 0 0 478.1 UTC(NIST) *")
+						string[] tokens = serverResponse.Split(' ');
+
+						// Check the number of tokens
+						if (tokens.Length >= 6)
+						{
+							// Check the health status
+							string health = tokens[5];
+							if (health == "0")
+							{
+								// Get date and time parts from the server response
+								string[] dateParts = tokens[1].Split('-');
+								string[] timeParts = tokens[2].Split(':');
+
+								// Create a DateTime instance
+								DateTime utcDateTime = new DateTime(
+									Convert.ToInt32(dateParts[0]) + 2000,
+									Convert.ToInt32(dateParts[1]), Convert.ToInt32(dateParts[2]),
+									Convert.ToInt32(timeParts[0]), Convert.ToInt32(timeParts[1]),
+									Convert.ToInt32(timeParts[2]));
+
+								// Convert received (UTC) DateTime value to the local timezone
+								result = utcDateTime.ToLocalTime();
+
+								return result;
+								// Response successfully received; exit the loop
+
+							}
+						}
+
+					}
+
+				}
+				catch
+				{
+					// Ignore exception and try the next server
+				}
+			}
+			return result;
 		}
 
 		public static string GetCurTimeString()
 		{
-			return DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
+			return GetCurTime().ToString("yyyy-MM-dd hh:mm:ss");
 		}
 
 		public static void WebLog(string strURL, string strMsg)