public Builder(Date created,Date lastModified){
  this.created=created != null ? new Date(created.getTime()) : null;
  this.lastModified=lastModified != null ? new Date(lastModified.getTime()) : null;
}

public Builder ( Date created , Date lastModified ) { this . created = created != null ? new Date ( created . getTime ( ) ) : null ; this . lastModified = lastModified != null ? new Date ( lastModified . getTime ( ) ) : null ; }
will set created to given value and lastmodified to system . currenttime only be used by the server . will be ignored by put and patch operations
