Datepicker one day off

[D-Thrane]

I get a date from the backend 2020-06-20.

I'm in Europe / Denmark. I set the select option on the datepicker with new Date(2020-06-20).
console.log shows: Sat Jun 20 2020 02:00:00 GMT+0200 (Central European Summer Time)
I get the correct date selected.

I change my browser timezone to Chicago. Send the same date. My console.log is looks the same. But the date picker selects 2020-06-19.

How do i fix this?

This code also has the error:

() => {

const [startDate, setStartDate] = useState(new Date());

function setSelected(date) {
const year = date.getUTCFullYear();
const month = ("0" + (date.getMonth()+1)).slice(-2);
const day = ("0" + date.getUTCDate()).slice(-2);
const newDate = month + "/" + day + "/" + year;
setStartDate(new Date(newDate));
}

  return (
    <DatePicker selected={startDate} onChange={(date) => setSelected(date)} />
  );
};