diff --git a/Foundation/src/LocalDateTime.cpp b/Foundation/src/LocalDateTime.cpp
index 720f41a4d2..487a2b325e 100644
--- a/Foundation/src/LocalDateTime.cpp
+++ b/Foundation/src/LocalDateTime.cpp
@@ -270,7 +270,7 @@ void LocalDateTime::determineTzd(bool adjust)
 		_tzd = (Timezone::utcOffset() + ((broken->tm_isdst == 1) ? 3600 : 0));
 #else
 		std::tm broken;
-#if defined(POCO_VXWORKS)
+#if defined(POCO_VXWORKS) && (defined(_VXWORKS_COMPATIBILITY_MODE) || (defined(_WRS_VXWORKS_MAJOR) && ((_WRS_VXWORKS_MAJOR < 6) || ((_WRS_VXWORKS_MAJOR == 6)  && (_WRS_VXWORKS_MINOR < 9)))))
 		if (localtime_r(&epochTime, &broken) != OK)
 			throw Poco::SystemException("cannot get local time");
 #else
@@ -280,6 +280,7 @@ void LocalDateTime::determineTzd(bool adjust)
 		_tzd = (Timezone::utcOffset() + ((broken.tm_isdst == 1) ? 3600 : 0));
 #endif
 		adjustForTzd();
+
 	}
 	else
 	{
diff --git a/Foundation/src/Timezone_VX.cpp b/Foundation/src/Timezone_VX.cpp
index 18339bffab..05c4cb2b15 100644
--- a/Foundation/src/Timezone_VX.cpp
+++ b/Foundation/src/Timezone_VX.cpp
@@ -35,7 +35,11 @@ int Timezone::dst()
 {
 	std::time_t now = std::time(NULL);
 	struct std::tm t;
+#if defined(_VXWORKS_COMPATIBILITY_MODE) || (defined(_WRS_VXWORKS_MAJOR) && ((_WRS_VXWORKS_MAJOR < 6) || ((_WRS_VXWORKS_MAJOR == 6)  && (_WRS_VXWORKS_MINOR < 9))))
 	if (localtime_r(&now, &t) != OK)
+#else
+	if (!localtime_r(&now, &t))
+#endif
 		throw Poco::SystemException("cannot get local time DST offset");
 	return t.tm_isdst == 1 ? 3600 : 0;
 }