diff --git a/src/internal/dateutil.cpp b/src/internal/dateutil.cpp
index 21b27be4..81e017dd 100644
--- a/src/internal/dateutil.cpp
+++ b/src/internal/dateutil.cpp
@@ -46,12 +46,12 @@ auto FILETIME_to_file_time_type( FILETIME fileTime ) -> fs::file_time_type {
 #endif
 }
 
-auto time_to_FILETIME( std::time_t timeValue ) -> FILETIME {
+auto time_to_FILETIME( std::time_t value ) -> FILETIME {
     // NOLINTNEXTLINE(*-magic-numbers)
-    const uint64_t timeInSeconds = ( static_cast< uint64_t >( timeValue ) * 10000000ull ) + 116444736000000000;
+    const std::uint64_t timeInSeconds = ( static_cast< std::uint64_t >( value ) * 10000000ull ) + 116444736000000000ull;
     FILETIME fileTime{};
     fileTime.dwLowDateTime = static_cast< DWORD >( timeInSeconds );
-    fileTime.dwHighDateTime = static_cast< DWORD >( timeInSeconds >> 32 );
+    fileTime.dwHighDateTime = static_cast< DWORD >( timeInSeconds >> 32ull );
     return fileTime;
 }
 
@@ -59,7 +59,7 @@ auto time_to_FILETIME( std::time_t timeValue ) -> FILETIME {
 
 auto FILETIME_to_time_type( FILETIME fileTime ) -> time_type {
     const FileTimeDuration fileTimeDuration{
-        ( static_cast< int64_t >( fileTime.dwHighDateTime ) << 32 ) + fileTime.dwLowDateTime
+        ( static_cast< std::uint64_t >( fileTime.dwHighDateTime ) << 32ull ) + fileTime.dwLowDateTime
     };
 
     const auto unixEpoch = fileTimeDuration + nt_to_unix_epoch;
diff --git a/src/internal/dateutil.hpp b/src/internal/dateutil.hpp
index e14c2c12..e72ebc93 100644
--- a/src/internal/dateutil.hpp
+++ b/src/internal/dateutil.hpp
@@ -24,7 +24,7 @@ namespace bit7z {
 
 auto FILETIME_to_file_time_type( FILETIME fileTime ) -> fs::file_time_type;
 
-auto time_to_FILETIME( std::time_t timeValue ) -> FILETIME;
+auto time_to_FILETIME( std::time_t value ) -> FILETIME;
 
 #endif