Setting "DD/MM/YYYY" format in MUI

Question

In my MUI form I'm using DatePicker to select dates for departure and return of users. But when I used .toLocaleDateString() it set my dates in mm-dd-yyyy format. But I wanted to set them as dd-mm-yyyy format. For that I've passed 'en-GB' as parameter in .toLocaleDateString(). But in the DatePicker TextField it shows a red border Like this and the pre-defined date (from the state) are also gone. Without the parameter it shows This which is the mm-dd-yyyy format. From the similar previous questions I even tried it through moment package and set the dt variable as moment(new Date()).format("DD/MM/YYYY") but it is still showing red border around the text field. I know this question was asked a lot of times before and I went through all of them and got no solution.

Date picker

const dt = new Date().toLocaleDateString();
  console.log(dt);
  const [formData, setFormData] = useState({
    from: "",
    to: "",
    depart: dt,
    return: dt,
    noOfPassenger: 1,
    tripType: "Return",
  });

   {/* App component  */}
       <div className="dates">
          <LocalizationProvider dateAdapter={AdapterDateFns}>
            <DatePicker
              label="Departure Date"
              disablePast
              onChange={(e) =>
                setFormData({
                  ...formData,
                  depart: e.toLocaleDateString(),
                })
              }
              value={formData.depart}
              renderInput={(params) => <TextField {...params} required />}
            />
          </LocalizationProvider>
        </div>

Answer 1

In my case I used a DateRangePicker, but it's the same across all pickers. Just set the inputFormat like here:

<DateRangePicker
     startText={t`From`}
     endText={t`To`}
     value={dateValue}
     inputFormat="dd.MM.yyyy"
     onChange={(newValue) => {
         setDateValue(newValue);
         console.log(newValue);
     }}
     renderInput={(startProps, endProps) => (
        <React.Fragment>
            <TextField {...startProps} />
            <TextField {...endProps} />
        </React.Fragment>
     )}
/>