datetime validation

src/main/scala/org/opengroup/osdu/production/util/validation/ValidationUtil.scala

@@ -131,7 +131,7 @@ object ValidationUtil extends LogF {
           logger.info(s"received data points2: ${timeSeries.timeSeriesDateTime.get.points}")
           val inValidDateTimes = timeSeries.timeSeriesDateTime.get.points.foldLeft(List.empty[String]) { (inValid, point) =>
             val pValue = point.value.asInstanceOf[String]
-            if Try(ZonedDateTime.parse(pValue)).isSuccess then inValid else pValue :: inValid
+            if pValue.nonEmpty && Try(ZonedDateTime.parse(pValue)).isSuccess && pValue.head.isDigit then inValid else pValue :: inValid
           }
 
           if (!inValidDateTimes.isEmpty) {