Calculate UTC time and display

ThunderboltTimeSync/FormMain.Designer.cs

@@ -23,13 +23,23 @@
 		/// the contents of this method with the code editor.
 		/// </summary>
 		private void InitializeComponent() {
+			this.labelTimestamps = new System.Windows.Forms.Label();
 			this.SuspendLayout();
 			// 
+			// labelTimestamps
+			// 
+			this.labelTimestamps.Dock = System.Windows.Forms.DockStyle.Fill;
+			this.labelTimestamps.Location = new System.Drawing.Point(0, 0);
+			this.labelTimestamps.Name = "labelTimestamps";
+			this.labelTimestamps.Size = new System.Drawing.Size(486, 358);
+			this.labelTimestamps.TabIndex = 0;
+			// 
 			// FormMain
 			// 
 			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
 			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-			this.ClientSize = new System.Drawing.Size(312, 316);
+			this.ClientSize = new System.Drawing.Size(486, 358);
+			this.Controls.Add(this.labelTimestamps);
 			this.Name = "FormMain";
 			this.Text = "Thunderbolt Time Sync";
 			this.ResumeLayout(false);
@@ -37,6 +47,8 @@
 		}
 
 		#endregion
+
+		private System.Windows.Forms.Label labelTimestamps;
 	}
 }
 

ThunderboltTimeSync/FormMain.cs

@@ -1,7 +1,6 @@
-using System.Collections.Generic;
+using System;
 using System.Diagnostics;
 using System.IO.Ports;
-using System.Linq;
 using System.Windows.Forms;
 
 namespace ThunderboltTimeSync {
@@ -20,13 +19,26 @@ namespace ThunderboltTimeSync {
 
 			InitializeComponent();
 
-			ThunderboltSerialPort tbsp = new ThunderboltSerialPort(new SerialPort("COM3"));
+			ThunderboltSerialPort tbsp = new ThunderboltSerialPort(new SerialPort("COM8"));
 
 			tbsp.PacketReceived += (ThunderboltPacket packet) => {
 				if (packet.IsPacketValid) {
 					if (packet.ID == 0x8F && packet.Data.Count == 17 && packet.Data[0] == 0xAB) {
-						ushort year = (ushort) (packet.Data[15] << 8 | packet.Data[16]);
-						Debug.WriteLine(year);
+						int timeOfWeek = packet.Data[1] << 24 | packet.Data[2] << 16 | packet.Data[3] << 8 | packet.Data[4];
+						ushort weekNumber = (ushort) (packet.Data[5] << 8 | packet.Data[6]);
+						short utcOffset = (short) (packet.Data[7] << 8 | packet.Data[8]);
+
+						// Current epoch for GPS week numbers is the morning of 22/8/1999
+						DateTime dateTime = new DateTime(1999, 8, 22, 0, 0, 0);
+
+						dateTime = dateTime.AddDays(7 * weekNumber);
+						dateTime = dateTime.AddSeconds(timeOfWeek);
+
+						dateTime = dateTime.AddSeconds(-utcOffset);
+
+						labelTimestamps.Invoke(new Action(() => {
+							labelTimestamps.Text += string.Format("{0} {1}\n", dateTime.ToLongDateString(), dateTime.ToLongTimeString());
+						}));
 					}
 				}
 			};