What does the initial state of the startDate and endDate hooks represent in this code, and how are these dates calculated in nextjs?

The initial state of the startDate and endDate hooks represents a date range starting from today and ending 7 days from today.

Calculation:

startDate:

• The startDate is initialised to today’s date, with the time component set to 00:00:00.
• It uses the current year, month, and day obtained from new Date().

endDate

• The endDate is initialised to a date 7 days after today, also with the time component set to 00:00:00.
• It adds 7 to the day of the current date while keeping the year and month the same.

Code:

const [startDate, setStartDate] = useState<Date | null>(() => {
  const today = new Date();
  return new Date(today.getFullYear(), today.getMonth(), today.getDate()); // Start at today
});


const [endDate, setEndDate] = useState<Date | null>(() => {
  const today = new Date();
  const sevenDaysLater = new Date(today.getFullYear(), today.getMonth(), today.getDate() + 7);
  return sevenDaysLater; // End 7 days from today
});