diff --git a/EgtLock.vcxproj b/EgtLock.vcxproj
index be82df2..8f63f92 100644
--- a/EgtLock.vcxproj
+++ b/EgtLock.vcxproj
@@ -22,6 +22,7 @@
     <ProjectGuid>{DD7F3502-6761-4B6D-BE79-B2DF4A5FC426}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
     <RootNamespace>EgtLock</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.17763.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
@@ -34,7 +35,7 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v120_xp</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
@@ -48,7 +49,7 @@
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>false</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v120_xp</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/KeyProc.cpp b/KeyProc.cpp
index 9574404..f85114e 100644
--- a/KeyProc.cpp
+++ b/KeyProc.cpp
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2014-2016
+//  EgalTech 2014-2019
 //----------------------------------------------------------------------------
-// File : KeyProc.cpp         Data : 12.07.16          Versione : 1.6s3
+// File : KeyProc.cpp         Data : 16.01.19          Versione : 2.1a1
 // Contenuto : Funzioni per la gestione della chiave.
 //
 //
@@ -27,7 +27,7 @@
 using namespace std ;
 
 //----------------------------------------------------------------------------
-static const int MIN_DAYS = 17562 ;  // giorni al 31/01/2018  dal 1/1/1970
+static const int MIN_DAYS = 17906 ;  // giorni al 10/01/2019  dal 1/1/1970
 static const int N_STEP = 7 ;
 
 //----------------------------------------------------------------------------
diff --git a/stdafx.h b/stdafx.h
index be9cc01..d4f9ad4 100644
--- a/stdafx.h
+++ b/stdafx.h
@@ -11,10 +11,10 @@
 #define _CRT_RAND_S
 #if defined( _DEBUG)
    #define _CRTDBG_MAP_ALLOC
-   #include <stdlib.h>
+   #include <cstdlib>
    #include <crtdbg.h>
 #else
-   #include <stdlib.h>
+   #include <cstdlib>
 #endif
 
 // in Debug controllo iteratori