58 lines
2.3 KiB
JavaScript
58 lines
2.3 KiB
JavaScript
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import addDays from '../addDays/index.js';
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import toDate from '../toDate/index.js';
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import toInteger from '../_lib/toInteger/index.js';
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/**
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* @name setDay
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* @category Weekday Helpers
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* @summary Set the day of the week to the given date.
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*
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* @description
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* Set the day of the week to the given date.
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*
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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* @param {Date|Number} date - the date to be changed
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* @param {Number} day - the day of the week of the new date
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* @param {Object} [options] - an object with options.
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* @param {Locale} [options.locale=defaultLocale] - the locale object. See [Locale]{@link https://date-fns.org/docs/Locale}
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* @param {0|1|2|3|4|5|6} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
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* @returns {Date} the new date with the day of the week set
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* @throws {TypeError} 2 arguments required
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* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
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*
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* @example
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* // Set Sunday to 1 September 2014:
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* var result = setDay(new Date(2014, 8, 1), 0)
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* //=> Sun Aug 31 2014 00:00:00
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*
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* @example
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* // If week starts with Monday, set Sunday to 1 September 2014:
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* var result = setDay(new Date(2014, 8, 1), 0, { weekStartsOn: 1 })
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* //=> Sun Sep 07 2014 00:00:00
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*/
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export default function setDay(dirtyDate, dirtyDay, dirtyOptions) {
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if (arguments.length < 2) {
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throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
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}
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var options = dirtyOptions || {};
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var locale = options.locale;
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var localeWeekStartsOn = locale && locale.options && locale.options.weekStartsOn;
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var defaultWeekStartsOn = localeWeekStartsOn == null ? 0 : toInteger(localeWeekStartsOn);
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var weekStartsOn = options.weekStartsOn == null ? defaultWeekStartsOn : toInteger(options.weekStartsOn); // Test if weekStartsOn is between 0 and 6 _and_ is not NaN
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if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
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throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
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}
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var date = toDate(dirtyDate, options);
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var day = toInteger(dirtyDay);
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var currentDay = date.getDay();
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var remainder = day % 7;
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var dayIndex = (remainder + 7) % 7;
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var diff = (dayIndex < weekStartsOn ? 7 : 0) + day - currentDay;
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return addDays(date, diff, options);
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}
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