docs: public boolean isEffective(Tuple tuple,
                                 RuleTerminalNode rtn,
                                 WorkingMemory workingMemory) {
          if ( !this.enabled.getValue( tuple,
                                       rtn.getEnabledDeclarations(),
                                       this,
                                       workingMemory ) ) {
              return false;
          }
          if ( this.dateEffective == null && this.dateExpires == null ) {
              return true;
          } else {
              Calendar now = Calendar.getInstance();
              now.setTimeInMillis( workingMemory.getSessionClock().getCurrentTime() );
  
              if ( this.dateEffective != null && this.dateExpires != null ) {
                  return (now.after( this.dateEffective ) && now.before( this.dateExpires ));
              } else if ( this.dateEffective != null ) {
                  return (now.after( this.dateEffective ));
              } else {
                  return (now.before( this.dateExpires ));
              }
          }
      }