date-fns/getDaysInMonth.js

"use strict";
exports.getDaysInMonth = getDaysInMonth;
var _index = require("./toDate.js");
var _index2 = require("./constructFrom.js");

/**
 * @name getDaysInMonth
 * @category Month Helpers
 * @summary Get the number of days in a month of the given date.
 *
 * @description
 * Get the number of days in a month of the given date.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param date - The given date
 *
 * @returns The number of days in a month
 *
 * @example
 * // How many days are in February 2000?
 * const result = getDaysInMonth(new Date(2000, 1))
 * //=> 29
 */
function getDaysInMonth(date) {
  const _date = (0, _index.toDate)(date);
  const year = _date.getFullYear();
  const monthIndex = _date.getMonth();
  const lastDayOfMonth = (0, _index2.constructFrom)(date, 0);
  lastDayOfMonth.setFullYear(year, monthIndex + 1, 0);
  lastDayOfMonth.setHours(0, 0, 0, 0);
  return lastDayOfMonth.getDate();
}