Re-added the "Flush old UDP packets before updating the time" fix to NTPClient.cpp. See https://github.com/arduino-libraries/NTPClient/pull/62

src/NTPClient.cpp

@@ -129,6 +129,9 @@ int NTPClient::getMinutes() const {
 int NTPClient::getSeconds() const {
   return (this->getEpochTime() % 60);
 }
+boolean NTPClient::getTimeValid() const {
+    return (this->_timeValid);
+}
 
 String NTPClient::getFormattedTime() const {
   unsigned long rawTime = this->getEpochTime();