47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
"use strict";
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
exports.default = startOfISOWeekYear;
|
|
|
|
var _index = _interopRequireDefault(require("../getISOWeekYear/index.js"));
|
|
|
|
var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
|
|
|
|
var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
/**
|
|
* @name startOfISOWeekYear
|
|
* @category ISO Week-Numbering Year Helpers
|
|
* @summary Return the start of an ISO week-numbering year for the given date.
|
|
*
|
|
* @description
|
|
* Return the start of an ISO week-numbering year,
|
|
* which always starts 3 days before the year's first Thursday.
|
|
* The result will be in the local timezone.
|
|
*
|
|
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
|
|
*
|
|
* @param {Date|Number} date - the original date
|
|
* @returns {Date} the start of an ISO week-numbering year
|
|
* @throws {TypeError} 1 argument required
|
|
*
|
|
* @example
|
|
* // The start of an ISO week-numbering year for 2 July 2005:
|
|
* const result = startOfISOWeekYear(new Date(2005, 6, 2))
|
|
* //=> Mon Jan 03 2005 00:00:00
|
|
*/
|
|
function startOfISOWeekYear(dirtyDate) {
|
|
(0, _index3.default)(1, arguments);
|
|
var year = (0, _index.default)(dirtyDate);
|
|
var fourthOfJanuary = new Date(0);
|
|
fourthOfJanuary.setFullYear(year, 0, 4);
|
|
fourthOfJanuary.setHours(0, 0, 0, 0);
|
|
var date = (0, _index2.default)(fourthOfJanuary);
|
|
return date;
|
|
}
|
|
|
|
module.exports = exports.default; |