58 lines
3.4 KiB
JavaScript
58 lines
3.4 KiB
JavaScript
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import getWeekYear from "../getWeekYear/index.js";
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import startOfWeek from "../startOfWeek/index.js";
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import toInteger from "../_lib/toInteger/index.js";
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import requiredArgs from "../_lib/requiredArgs/index.js";
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import { getDefaultOptions } from "../_lib/defaultOptions/index.js";
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/**
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* @name startOfWeekYear
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* @category Week-Numbering Year Helpers
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* @summary Return the start of a local week-numbering year for the given date.
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*
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* @description
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* Return the start of a local week-numbering year.
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* The exact calculation depends on the values of
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* `options.weekStartsOn` (which is the index of the first day of the week)
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* and `options.firstWeekContainsDate` (which is the day of January, which is always in
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* the first week of the week-numbering year)
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*
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* Week numbering: https://en.wikipedia.org/wiki/Week#Week_numbering
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*
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* @param {Date|Number} date - the original 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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* @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
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* @returns {Date} the start of a week-numbering year
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* @throws {TypeError} 1 argument required
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* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
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* @throws {RangeError} `options.firstWeekContainsDate` must be between 1 and 7
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*
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* @example
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* // The start of an a week-numbering year for 2 July 2005 with default settings:
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* const result = startOfWeekYear(new Date(2005, 6, 2))
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* //=> Sun Dec 26 2004 00:00:00
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*
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* @example
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* // The start of a week-numbering year for 2 July 2005
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* // if Monday is the first day of week
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* // and 4 January is always in the first week of the year:
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* const result = startOfWeekYear(new Date(2005, 6, 2), {
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* weekStartsOn: 1,
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* firstWeekContainsDate: 4
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* })
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* //=> Mon Jan 03 2005 00:00:00
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*/
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export default function startOfWeekYear(dirtyDate, options) {
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var _ref, _ref2, _ref3, _options$firstWeekCon, _options$locale, _options$locale$optio, _defaultOptions$local, _defaultOptions$local2;
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requiredArgs(1, arguments);
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var defaultOptions = getDefaultOptions();
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var firstWeekContainsDate = toInteger((_ref = (_ref2 = (_ref3 = (_options$firstWeekCon = options === null || options === void 0 ? void 0 : options.firstWeekContainsDate) !== null && _options$firstWeekCon !== void 0 ? _options$firstWeekCon : options === null || options === void 0 ? void 0 : (_options$locale = options.locale) === null || _options$locale === void 0 ? void 0 : (_options$locale$optio = _options$locale.options) === null || _options$locale$optio === void 0 ? void 0 : _options$locale$optio.firstWeekContainsDate) !== null && _ref3 !== void 0 ? _ref3 : defaultOptions.firstWeekContainsDate) !== null && _ref2 !== void 0 ? _ref2 : (_defaultOptions$local = defaultOptions.locale) === null || _defaultOptions$local === void 0 ? void 0 : (_defaultOptions$local2 = _defaultOptions$local.options) === null || _defaultOptions$local2 === void 0 ? void 0 : _defaultOptions$local2.firstWeekContainsDate) !== null && _ref !== void 0 ? _ref : 1);
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var year = getWeekYear(dirtyDate, options);
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var firstWeek = new Date(0);
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firstWeek.setFullYear(year, 0, firstWeekContainsDate);
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firstWeek.setHours(0, 0, 0, 0);
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var date = startOfWeek(firstWeek, options);
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return date;
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}
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