I am using material ui datepicker -

<MuiPickersUtilsProvider utils={DateFnsUtils}>
      <DatePicker value={selectedDate} onChange={date=>handleDateChange(date)} 
                  shouldDisableDate={disableWeekends} />
</MuiPickersUtilsProvider>

function disableWeekneds(date){
  let datesToDisabled=['2021-10-18','2021-10-20']
  const dateInt = [
   datesToDisabled[0],
datesToDisabled[1]
];
let isToDisabled=dateInt.includes(date.toISOString().split('T')[0])

return date.getDay()==6 || date.getDay()==0 || isToDisabled;
}

Here in disable weekends function I am disabling weekends + custom dates. When I open calender , I see disabled dates to be - 19th Oct and 20th Oct.

How can I resolve this? I tried with - parseISO , but no use.