64 lines
2.9 KiB
JavaScript
64 lines
2.9 KiB
JavaScript
|
import getWeekYear from '../getWeekYear/index.js';
|
||
|
|
import startOfWeek from '../startOfWeek/index.js';
|
||
|
|
import toInteger from '../_lib/toInteger/index.js';
|
||
|
|
/**
|
||
|
|
* @name startOfWeekYear
|
||
|
|
* @category Week-Numbering Year Helpers
|
||
|
|
* @summary Return the start of a local week-numbering year for the given date.
|
||
|
|
*
|
||
|
|
* @description
|
||
|
|
* Return the start of a local week-numbering year.
|
||
|
|
* 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#Week_numbering
|
||
|
|
*
|
||
|
|
* ### 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 original 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)
|
||
|
|
* @param {1|2|3|4|5|6|7} [options.firstWeekContainsDate=1] - the day of January, which is always in the first week of the year
|
||
|
|
* @returns {Date} the start of a week-numbering year
|
||
|
|
* @throws {TypeError} 1 argument required
|
||
|
|
* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
|
||
|
|
* @throws {RangeError} `options.firstWeekContainsDate` must be between 1 and 7
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // The start of an a week-numbering year for 2 July 2005 with default settings:
|
||
|
|
* var result = startOfWeekYear(new Date(2005, 6, 2))
|
||
|
|
* //=> Sun Dec 26 2004 00:00:00
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // The start of a week-numbering year for 2 July 2005
|
||
|
|
* // if Monday is the first day of week
|
||
|
|
* // and 4 January is always in the first week of the year:
|
||
|
|
* var result = startOfWeekYear(new Date(2005, 6, 2), {
|
||
|
|
* weekStartsOn: 1,
|
||
|
|
* firstWeekContainsDate: 4
|
||
|
|
* })
|
||
|
|
* //=> Mon Jan 03 2005 00:00:00
|
||
|
|
*/
|
||
|
|
|
||
|
|
export default function startOfWeekYear(dirtyDate, dirtyOptions) {
|
||
|
|
if (arguments.length < 1) {
|
||
|
|
throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
|
||
|
|
}
|
||
|
|
|
||
|
|
var options = dirtyOptions || {};
|
||
|
|
var locale = options.locale;
|
||
|
|
var localeFirstWeekContainsDate = locale && locale.options && locale.options.firstWeekContainsDate;
|
||
|
|
var defaultFirstWeekContainsDate = localeFirstWeekContainsDate == null ? 1 : toInteger(localeFirstWeekContainsDate);
|
||
|
|
var firstWeekContainsDate = options.firstWeekContainsDate == null ? defaultFirstWeekContainsDate : toInteger(options.firstWeekContainsDate);
|
||
|
|
var year = getWeekYear(dirtyDate, dirtyOptions);
|
||
|
|
var firstWeek = new Date(0);
|
||
|
|
firstWeek.setFullYear(year, 0, firstWeekContainsDate);
|
||
|
|
firstWeek.setHours(0, 0, 0, 0);
|
||
|
|
var date = startOfWeek(firstWeek, dirtyOptions);
|
||
|
|
return date;
|
||
|
|
}
|