@Override
 public String toString() {
   return String.format(
       "CreationDate: %s\nName: %s\nMembers:\n\t%s",
       DateTimeFormatter.ISO_LOCAL_DATE_TIME
           .withZone(ZoneId.systemDefault())
           .format(creationInstant),
       name,
       Joiner.on("\n\t").join(members));
 }
 public String getDate() {
   return DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(LocalDateTime.now());
 }