fix: Fix DateTimeHelper date format

Resolves #45 (closed)

core/src/main/java/org/eclipsefoundation/core/helper/DateTimeHelper.java

@@ -29,7 +29,7 @@ import org.slf4j.LoggerFactory;
  */
 public class DateTimeHelper {
     private static final Logger LOGGER = LoggerFactory.getLogger(DateTimeHelper.class);
-    public static final String RAW_RFC_3339_FORMAT = "uuuu-MM-dd'T'HH:mm:ssXXX";
+    public static final String RAW_RFC_3339_FORMAT = "yyyy-MM-dd'T'HH:mm:ssXXX";
     private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern(RAW_RFC_3339_FORMAT);
 
     /**