You're using the wrong object keys in your expenseData object in the ExpenseForm component. And so the date will "always" be undefined thus failed during the date conversion in your ExpenseDate component. To fix this, you just need to supply the correct object:

From this:

const expenseData = {
    inputValue: enteredValue,
    inputAmount: enteredAmount,
    inputDate: new Date(enteredDate),
};

To this:

const expenseData = {
    id: "e5", // You will need to figure out a way to create a dynamic ID here :)
    title: enteredValue,
    amount: enteredAmount,
    date: new Date(enteredDate),
};