fix check if dateTim is valid

src/main/java/com/smartharvester/service/MappingService.java

@@ -16,6 +16,9 @@ import org.springframework.stereotype.Service;
 import org.springframework.web.client.HttpClientErrorException.BadRequest;
 import org.springframework.web.client.RestTemplate;
 
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
@@ -108,6 +111,10 @@ public class MappingService {
         return distributionStrings;
     }
 
+    private static OffsetDateTime parseDateTimeLiteral(String literal) {
+        return OffsetDateTime.parse(literal, DateTimeFormatter.ISO_OFFSET_DATE_TIME);
+    }
+
     public String write(String indentifier, String value) {
         value = value.replaceAll("[\\r\\n]+", " ").replaceAll("\"", "\\\\\"");
         String property = "";
@@ -125,7 +132,17 @@ public class MappingService {
                 break;
             case "dct:issued":
             case "dct:modified":
-                property += indentifier + " \"" + value + "\"^^xsd:dateTime;\n";
+                try {
+                    OffsetDateTime offsetDateTime = parseDateTimeLiteral(value);
+                    if (offsetDateTime.getYear() < 1000) {
+                        break;
+                    } else {
+                        property += indentifier + " \"" + value + "\"^^xsd:dateTime;\n";
+                    }
+                } catch (DateTimeParseException e) {
+                    break;
+                }
+
                 break;
             case "dct:publisher":
                 property += indentifier + "[ a foaf:Agent; foaf:name \"" + value + "\"];\n";