add analyzers and api

MareSynchronos/Utils/VariousExtensions.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MareSynchronos.Utils;
+
+public static class VariousExtensions
+{
+    public static DateTime GetLinkerTime(Assembly assembly)
+    {
+        const string BuildVersionMetadataPrefix = "+build";
+
+        var attribute = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+        if (attribute?.InformationalVersion != null)
+        {
+            var value = attribute.InformationalVersion;
+            var index = value.IndexOf(BuildVersionMetadataPrefix, StringComparison.Ordinal);
+            if (index > 0)
+            {
+                value = value[(index + BuildVersionMetadataPrefix.Length)..];
+                return DateTime.ParseExact(value, "yyyy-MM-ddTHH:mm:ss:fffZ", CultureInfo.InvariantCulture);
+            }
+        }
+
+        return default;
+    }
+}