How can I save this DatePicker to firestore in a timestamp format?

Question

I wanted to save it in a firestore but currently it saves like this 1/20/2021

const [seconDate, setSecondDate] = useState(new Date());

<MuiPickersUtilsProvider utils={DateFnsUtils}>
                          <DatePicker
                            format="MM/dd/yyyy"
                            value={secondDate}
                            onChange={setSeconDate}
                            fullWidth
                            id="date-picker-inline"
               
                          />
                        </MuiPickersUtilsProvider>

Answer 1

When submitting to firebase, process the date like so.

const dateArray = seconDate.split('/');
const dateFormatted = new Date(dateArray[2], dateArray[1] - 1, dateArray[0]);
const timestamp = dateFormatted.getTime();
console.log(timestamp);