The getDay() method returns the day of the week (0 to 6) of a date (Sunday = 0, Monday = 1)

dayOfWeekDigit = new Date().getDay();

console.log( ldayOfWeekName ); 

ldayOfWeekName = new Date().toLocaleString(
  'default', {weekday: 'long'}
);
console.log( ldayOfWeekName );