Tumortisch-Dist/resources/app/node_modules/date-fns/esm/getWeekOfMonth/index.js
2021-06-15 16:00:08 +02:00

69 lines
2.4 KiB
JavaScript

import getDate from '../getDate/index.js';
import getDay from '../getDay/index.js';
import startOfMonth from '../startOfMonth/index.js';
import toInteger from '../_lib/toInteger/index.js';
/**
* @name getWeekOfMonth
* @category Week Helpers
* @summary Get the week of the month of the given date.
*
* @description
* Get the week of the month of the given date.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @param {Date|Number} date - the given date
* @param {Object} [options] - an object with options.
* @param {Locale} [options.locale=defaultLocale] - the locale object. See [Locale]{@link https://date-fns.org/docs/Locale}
* @param {0|1|2|3|4|5|6} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
* @returns {Number} the week of month
* @throws {TypeError} 1 argument required
* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
*
* @example
* // Which week of the month is 9 November 2017?
* var result = getWeekOfMonth(new Date(2017, 10, 9))
* //=> 2
*/
export default function getWeekOfMonth(date, dirtyOptions) {
if (arguments.length < 1) {
throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
}
var options = dirtyOptions || {};
var locale = options.locale;
var localeWeekStartsOn = locale && locale.options && locale.options.weekStartsOn;
var defaultWeekStartsOn = localeWeekStartsOn == null ? 0 : toInteger(localeWeekStartsOn);
var weekStartsOn = options.weekStartsOn == null ? defaultWeekStartsOn : toInteger(options.weekStartsOn); // Test if weekStartsOn is between 0 and 6 _and_ is not NaN
if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
}
var currentDayOfMonth = getDate(date);
if (isNaN(currentDayOfMonth)) {
return currentDayOfMonth;
}
var startWeekDay = getDay(startOfMonth(date));
var lastDayOfFirstWeek = 0;
if (startWeekDay >= weekStartsOn) {
lastDayOfFirstWeek = weekStartsOn + 7 - startWeekDay;
} else {
lastDayOfFirstWeek = weekStartsOn - startWeekDay;
}
var weekNumber = 1;
if (currentDayOfMonth > lastDayOfFirstWeek) {
var remainingDaysAfterFirstWeek = currentDayOfMonth - lastDayOfFirstWeek;
weekNumber = weekNumber + Math.ceil(remainingDaysAfterFirstWeek / 7);
}
return weekNumber;
}