print build time and date

TheGuardians · Apr 28, 2024 · 50ace23 · 50ace23
1 parent 4272db0
commit 50ace23
Showing 1 changed file with 24 additions and 1 deletion.
diff --git a/TagTool/Program.cs b/TagTool/Program.cs
@@ -33,7 +33,7 @@ static void Main(string[] args)
 
             if (autoexecCommand == null)
             {
-                Console.WriteLine($"TagTool [{Assembly.GetExecutingAssembly().GetName().Version}]");
+                Console.WriteLine($"TagTool [{Assembly.GetExecutingAssembly().GetName().Version} (Built {GetLinkerTimestampUtc(Assembly.GetExecutingAssembly())} UTC)]");
                 Console.WriteLine();
                 Console.WriteLine("Please report any bugs and/or feature requests:");
                 Console.WriteLine("https://github.com/TheGuardians-CI/TagTool/issues");
@@ -212,5 +212,28 @@ public static void ReportElapsed()
             WarningCount = 0;
             _stopWatch.Reset();
         }
+
+        public static DateTime GetLinkerTimestampUtc(Assembly assembly)
+        {
+            var location = assembly.Location;
+            return GetLinkerTimestampUtc(location);
+        }
+
+        public static DateTime GetLinkerTimestampUtc(string filePath)
+        {
+            const int peHeaderOffset = 60;
+            const int linkerTimestampOffset = 8;
+            var bytes = new byte[2048];
+
+            using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
+            {
+                file.Read(bytes, 0, bytes.Length);
+            }
+
+            var headerPos = BitConverter.ToInt32(bytes, peHeaderOffset);
+            var secondsSince1970 = BitConverter.ToInt32(bytes, headerPos + linkerTimestampOffset);
+            var dt = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            return dt.AddSeconds(secondsSince1970);
+        }
     }
 }