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Filename : getWeek.cjs
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"use strict";
exports.getWeek = getWeek;
var _index = require("./constants.cjs");
var _index2 = require("./startOfWeek.cjs");
var _index3 = require("./startOfWeekYear.cjs");
var _index4 = require("./toDate.cjs");

/**
 * The {@link getWeek} function options.
 */

/**
 * @name getWeek
 * @category Week Helpers
 * @summary Get the local week index of the given date.
 *
 * @description
 * Get the local week index of the given date.
 * The exact calculation depends on the values of
 * `options.weekStartsOn` (which is the index of the first day of the week)
 * and `options.firstWeekContainsDate` (which is the day of January, which is always in
 * the first week of the week-numbering year)
 *
 * Week numbering: https://en.wikipedia.org/wiki/Week#The_ISO_week_date_system
 *
 * @param date - The given date
 * @param options - An object with options
 *
 * @returns The week
 *
 * @example
 * // Which week of the local week numbering year is 2 January 2005 with default options?
 * const result = getWeek(new Date(2005, 0, 2))
 * //=> 2
 *
 * @example
 * // Which week of the local week numbering year is 2 January 2005,
 * // if Monday is the first day of the week,
 * // and the first week of the year always contains 4 January?
 * const result = getWeek(new Date(2005, 0, 2), {
 *   weekStartsOn: 1,
 *   firstWeekContainsDate: 4
 * })
 * //=> 53
 */
function getWeek(date, options) {
  const _date = (0, _index4.toDate)(date, options?.in);
  const diff =
    +(0, _index2.startOfWeek)(_date, options) -
    +(0, _index3.startOfWeekYear)(_date, options);

  // Round the number of weeks to the nearest integer because the number of
  // milliseconds in a week is not constant (e.g. it's different in the week of
  // the daylight saving time clock shift).
  return Math.round(diff / _index.millisecondsInWeek) + 1;
}