Find all the days in a month with Date object?

is there a way to have all the days of a month or of a year? I am looking for this in order to disable some specific days in a datepicker, i would have a page in the back-office to select these days to disable.

So i would need to show all the days in a month, and add a "activate or deactive" button below each day. Is there a way to find these days with the Date object? I found this link for example : https://stackoverflow.com/questions/6729497/displaying-all-the-days-of-a-month but i don't really understand it, plus it is Java, i am trying to find a solution in javascript.

Thank you for your help

Answer

September 6, 2021

KyleMit

Using ES6 Array Initializer

You can get the number of days in a specified month, and then create a new array with that length and each of the days as items.

const getAllDaysInMonth = (month, year) =>
  Array.from(
    { length: new Date(year, month, 0).getDate() },
    (_, i) => new Date(year, month - 1, i + 1)
  );

Demo in Stack Snippets

const getAllDaysInMonth = (month, year) =>
  Array.from(
    {length: new Date(year, month, 0).getDate()}, // get next month, zeroth's (previous) day
    (_, i) => new Date(year, month - 1, i + 1)    // get current month (0 based index)
  );

const allDatesInOctober = getAllDaysInMonth(10, 2021)

console.log(allDatesInOctober.map(x => x.toLocaleDateString([], { month: "short", day: "numeric" })))

// ['Oct 1', 'Oct 2', 'Oct 3', 'Oct 4', 'Oct 5', 'Oct 6', 'Oct 7', 'Oct 8', 'Oct 9', 'Oct 10', 'Oct 11', 'Oct 12', 'Oct 13', 'Oct 14', 'Oct 15', 'Oct 16', 'Oct 17', 'Oct 18', 'Oct 19', 'Oct 20', 'Oct 21', 'Oct 22', 'Oct 23', 'Oct 24', 'Oct 25', 'Oct 26', 'Oct 27', 'Oct 28', 'Oct 29', 'Oct 30', 'Oct 31']