diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 79a3d82790b7afb5ece9d4b7c6e1b2aa5a5d8aa1..9fbb4b9b431f30641751d787d417d806efaca008 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -83,6 +83,7 @@ sub GenerateFiles {
 		}
 		print O "/* defines added by config steps */\n";
 		print O "#define USE_ASSERT_CHECKING 1\n" if ($self->{options}->{asserts});
+		print O "#define USE_INTEGER_DATETIMES 1\n" if ($self->{options}->{integer_datetimes});
 		print O "#define USE_LDAP 1\n" if ($self->{options}->{ldap});
 		print O "#define HAVE_LIBZ 1\n" if ($self->{options}->{zlib});
 		print O "#define USE_SSL 1\n" if ($self->{options}->{openssl});
diff --git a/src/tools/msvc/config.pl b/src/tools/msvc/config.pl
index 56de6139c16cd57f4b0638b276e0a19c8d47428f..bdf101f72d1623a92524f8eabf0718931d650e4d 100644
--- a/src/tools/msvc/config.pl
+++ b/src/tools/msvc/config.pl
@@ -4,6 +4,7 @@ use warnings;
 
 our $config = {
 	asserts=>1,			# --enable-cassert
+	integer_datetimes=>1,   # --enable-integer-datetimes
 	nls=>undef,				# --enable-nls=<path>
 	tcl=>'c:\tcl',		# --with-tls=<path>
 	perl=>'c:\perl', 			# --with-perl