48 lines
1.6 KiB
JavaScript
48 lines
1.6 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = lastDayOfISOWeekYear;
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var _index = _interopRequireDefault(require("../getISOWeekYear/index.js"));
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var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
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var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* @name lastDayOfISOWeekYear
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* @category ISO Week-Numbering Year Helpers
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* @summary Return the last day of an ISO week-numbering year for the given date.
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*
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* @description
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* Return the last day of an ISO week-numbering year,
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* which always starts 3 days before the year's first Thursday.
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* The result will be in the local timezone.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @param {Date|Number} date - the original date
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* @returns {Date} the end of an ISO week-numbering year
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // The last day of an ISO week-numbering year for 2 July 2005:
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* const result = lastDayOfISOWeekYear(new Date(2005, 6, 2))
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* //=> Sun Jan 01 2006 00:00:00
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*/
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function lastDayOfISOWeekYear(dirtyDate) {
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(0, _index3.default)(1, arguments);
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var year = (0, _index.default)(dirtyDate);
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var fourthOfJanuary = new Date(0);
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fourthOfJanuary.setFullYear(year + 1, 0, 4);
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fourthOfJanuary.setHours(0, 0, 0, 0);
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var date = (0, _index2.default)(fourthOfJanuary);
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date.setDate(date.getDate() - 1);
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return date;
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}
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module.exports = exports.default; |