diff --git a/KeyGenerator.cpp b/KeyGenerator.cpp
index 7b8f276..f9b3e2a 100644
--- a/KeyGenerator.cpp
+++ b/KeyGenerator.cpp
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2013-2024
+//  EgalTech 2013-2025
 //----------------------------------------------------------------------------
-// File : KeyGenerator.cpp       Data : 16.01.24          Versione : 2.6a1
+// File : KeyGenerator.cpp       Data : 02.01.26          Versione : 3.1a1
 // Contenuto : Implementazione della classe applicazione generatore chiavi.
 //
 //
@@ -85,7 +85,7 @@ CKeyGeneratorApp::InitInstance( void)
   // verifico la protezione
    SetLockType( KEY_LOCK_TYPE_HW) ;
    string sKey = GetPrivateProfileStringUtf8( "General", "Key", "", m_pszProfileName) ;
-   if ( VerifyKey( sKey, 823, 2701, 10) != KEY_OK) {
+   if ( VerifyKey( sKey, 823, 3101, 10) != KEY_OK) {
       m_nExitCode = 1 ;
       return FALSE ;
    }
diff --git a/KeyGenerator.rc b/KeyGenerator.rc
index b07d6f1..f3cec24 100644
Binary files a/KeyGenerator.rc and b/KeyGenerator.rc differ
diff --git a/KeyGenerator.vcxproj b/KeyGenerator.vcxproj
index 91ebb62..7b21db1 100644
--- a/KeyGenerator.vcxproj
+++ b/KeyGenerator.vcxproj
@@ -63,7 +63,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>WIN32;_WINDOWS;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -95,7 +95,7 @@
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
-      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/KeyGeneratorDlg.cpp b/KeyGeneratorDlg.cpp
index 7e97383..23663a2 100644
--- a/KeyGeneratorDlg.cpp
+++ b/KeyGeneratorDlg.cpp
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2013-2025
+//  EgalTech 2013-2026
 //----------------------------------------------------------------------------
-// File : KeyGeneratorDlg.cpp       Data : 13.01.25       Versione : 2.7a1
+// File : KeyGeneratorDlg.cpp       Data : 02.01.26       Versione : 3.1a1
 // Contenuto : Implementazione della classe dialogo generatore chiavi.
 //
 //
@@ -15,6 +15,7 @@
 //             05.01.24 DS Aggiunta versione 26.
 //             05.10.24 DS Aggiunto Effector.
 //             13.01.25 DS Aggiunta versione 27.
+//             02.01.26 DS Aggiunta versione 31.
 //
 //----------------------------------------------------------------------------
 
@@ -51,7 +52,7 @@ static const vector<string> vsProd = {
    "9935"      // EgtEngine
 } ;            // altri valori : 463, 719, 975, 1487, 2255, 2511, 3535, 4559, 9679 (max 9999 e deve contenere i bit di 207)
 static const vector<string> vsVer = {
-  "27", "26", "25", "24", "23", "22", "21", "19", "18", "16", "15"
+  "31", "27", "26", "25", "24", "23", "22", "21", "19", "18", "16", "15"
 } ;
 static const vector<string> vsSubVer = {
    "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", ""
@@ -343,8 +344,10 @@ CKeyGeneratorDlg::LoadFile( const char* szFile)
    int nLev = GetPrivateProfileInt( sSec.c_str(), "Lev", 0, szFile) ;
    ((CComboBox*)GetDlgItem( IDC_LEV))->SetCurSel( nLev - 1) ;
    int nExpTime = GetPrivateProfileInt( sSec.c_str(), "ExpDays", 0, szFile) ;
-   if ( nExpTime != 0)
-      ((CDateTimeCtrl*)GetDlgItem( IDC_EXPIRATION))->SetTime( &CTime( unsigned( nExpTime) * 24 * 3600)) ;
+   if ( nExpTime != 0) {
+      CTime time( unsigned( nExpTime) * 24 * 3600) ;
+      ((CDateTimeCtrl*)GetDlgItem( IDC_EXPIRATION))->SetTime( &time) ;
+   }
    int nOpt1 = GetPrivateProfileInt( sSec.c_str(), "Opt1", 0, szFile) ;
    for ( int i = IDC_CHECK01, j = 0 ; i <= IDC_CHECK16 ; ++ i, ++ j) {
       if ( ( nOpt1 & ( 1 << j)) != 0)
@@ -361,8 +364,10 @@ CKeyGeneratorDlg::LoadFile( const char* szFile)
    }
    // check non ancora inseriti nel dialogo
    int nOptExpTime = GetPrivateProfileInt( sSec.c_str(), "OptExpDays", 0, szFile) ;
-   if ( nOptExpTime != 0)
-      ((CDateTimeCtrl*)GetDlgItem( IDC_OPT_EXPIR))->SetTime( &CTime( unsigned( nOptExpTime) * 24 * 3600)) ;
+   if ( nOptExpTime != 0) {
+      CTime time( unsigned( nOptExpTime) * 24 * 3600) ;
+      ((CDateTimeCtrl*)GetDlgItem( IDC_OPT_EXPIR))->SetTime( &time) ; 
+   }
    return true ;
 }