diff --git a/Sources/kasthack.vksharp/Internal/Converters/UnixTimeConverter.cs b/Sources/kasthack.vksharp/Internal/Converters/UnixTimeConverter.cs
index 302ea72..860f246 100644
--- a/Sources/kasthack.vksharp/Internal/Converters/UnixTimeConverter.cs
+++ b/Sources/kasthack.vksharp/Internal/Converters/UnixTimeConverter.cs
@@ -32,7 +32,7 @@ public override object ReadJson( JsonReader reader, Type objectType, object exis
             var jsonValue = serializer.Deserialize<JValue>(reader);
             switch ( jsonValue.Type ) {
                 case JTokenType.Integer:
-                    var dto = DateTimeOffset.FromUnixTimeSeconds( jsonValue.Value<long>() );
+                    var dto = DateTimeOffsetHelper.FromUnixTimeSeconds( jsonValue.Value<long>() );
                     if ( objectType == DateTimeOffsetType || ( objectType.IsNullable() && Nullable.GetUnderlyingType( objectType ) == DateTimeOffsetType ) )
                         return dto;
                     return dto.LocalDateTime;
diff --git a/Sources/kasthack.vksharp/Internal/DateTimeOffsetHelper.cs b/Sources/kasthack.vksharp/Internal/DateTimeOffsetHelper.cs
new file mode 100644
index 0000000..f6a4c49
--- /dev/null
+++ b/Sources/kasthack.vksharp/Internal/DateTimeOffsetHelper.cs
@@ -0,0 +1,17 @@
+using System;
+
+namespace kasthack.vksharp.Internal {
+    public static class DateTimeOffsetHelper {
+
+        private static readonly DateTimeOffset sTime = new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero);
+
+        public static int ToUnixTimeSeconds(this DateTimeOffset offset) {
+            return (int) (offset - sTime).TotalSeconds;
+        }
+
+        public static DateTimeOffset FromUnixTimeSeconds(long seconds) {
+            return sTime.AddSeconds(seconds);
+        }
+
+    }
+}
diff --git a/Sources/kasthack.vksharp/Properties/AssemblyInfo.cs b/Sources/kasthack.vksharp/Properties/AssemblyInfo.cs
index c526cb5..36af47f 100644
--- a/Sources/kasthack.vksharp/Properties/AssemblyInfo.cs
+++ b/Sources/kasthack.vksharp/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.6.1.*")]
+[assembly: AssemblyVersion("0.6.3.*")]
 [assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/Sources/kasthack.vksharp/kasthack.vksharp.csproj b/Sources/kasthack.vksharp/kasthack.vksharp.csproj
index a1bca49..3499a26 100644
--- a/Sources/kasthack.vksharp/kasthack.vksharp.csproj
+++ b/Sources/kasthack.vksharp/kasthack.vksharp.csproj
@@ -9,8 +9,9 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>kasthack.vksharp</RootNamespace>
     <AssemblyName>kasthack.vksharp</AssemblyName>
-    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -215,6 +216,7 @@
     <Compile Include="Internal\Converters\SnakeCaseContractResolver.cs" />
     <Compile Include="Internal\Converters\SnakeCaseEnumConverter.cs" />
     <Compile Include="Internal\Converters\UnixTimeConverter.cs" />
+    <Compile Include="Internal\DateTimeOffsetHelper.cs" />
     <Compile Include="Internal\MiscTools.cs" />
     <Compile Include="Internal\MorozovHandler.cs" />
     <Compile Include="Internal\ProxyPoolingHttpClientHandler.cs" />
@@ -228,8 +230,8 @@
     <Compile Include="Token.cs" />
   </ItemGroup>
   <ItemGroup>
-    <Content Include="favicon.ico" />
-    <Content Include="Generated\AllMethods.txt" />
+    <None Include="favicon.ico" />
+    <None Include="Generated\AllMethods.txt" />
     <None Include="Generated\Methods.xml">
       <SubType>Designer</SubType>
     </None>