Date { NaN } React Native

I’m using react native and I’m trying to convert my timestamp data to date but the output said “Date { NaN }”

       const [eventData1, setEventData1] = useState({});
        
          useEffect(() => {
            database()
              .ref('path')
              .on('value', snapshot => {
                if (snapshot.val() !== null) {
                  setEventData1({...snapshot.val()});
                } else {
                  setEventData1({});
                }
              });
        
            return () => {
              setEventData1([]);
            };
          }, []);
    
     const dates = Object.keys(eventData1).map(
        id => eventData1[id].start_DATE * 1000,
      );
      const sDate = new Date(dates);

Outputs

    console.log(eventData1) -----> //[1648703685000, 1648623600000]//
    
    console.log(sDate) ------> //Date { NaN }//