Store the date a build is created

src/Jackett.Common/Utils/BuildDate.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Globalization;
+using System.Reflection;
+
+namespace Jackett.Common.Utils
+{
+    public static class BuildDate
+    {
+        public static DateTime GetBuildDateTime()
+        {
+            Assembly commonAssembly = Assembly.GetExecutingAssembly();
+            var attribute = commonAssembly.GetCustomAttribute<BuildDateAttribute>();
+            return attribute?.DateTime ?? default(DateTime);
+        }
+    }
+
+    [AttributeUsage(AttributeTargets.Assembly)]
+    public class BuildDateAttribute : Attribute
+    {
+        public BuildDateAttribute(string value)
+        {
+            DateTime = DateTime.ParseExact(value, "yyyyMMddHHmmss", CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal);
+        }
+
+        public DateTime DateTime { get; }
+    }
+}