You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.3 KiB
67 lines
2.3 KiB
"use strict";
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
exports.default = getISOWeekYear;
|
|
|
|
var _index = _interopRequireDefault(require("../toDate/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 getISOWeekYear
|
|
* @category ISO Week-Numbering Year Helpers
|
|
* @summary Get the ISO week-numbering year of the given date.
|
|
*
|
|
* @description
|
|
* Get the ISO week-numbering year of the given date,
|
|
* which always starts 3 days before the year's first Thursday.
|
|
*
|
|
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
|
|
*
|
|
* ### 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).
|
|
*
|
|
* - The function was renamed from `getISOYear` to `getISOWeekYear`.
|
|
* "ISO week year" is short for [ISO week-numbering year](https://en.wikipedia.org/wiki/ISO_week_date).
|
|
* This change makes the name consistent with
|
|
* locale-dependent week-numbering year helpers, e.g., `getWeekYear`.
|
|
*
|
|
* @param {Date|Number} date - the given date
|
|
* @returns {Number} the ISO week-numbering year
|
|
* @throws {TypeError} 1 argument required
|
|
*
|
|
* @example
|
|
* // Which ISO-week numbering year is 2 January 2005?
|
|
* var result = getISOWeekYear(new Date(2005, 0, 2))
|
|
* //=> 2004
|
|
*/
|
|
function getISOWeekYear(dirtyDate) {
|
|
(0, _index3.default)(1, arguments);
|
|
var date = (0, _index.default)(dirtyDate);
|
|
var year = date.getFullYear();
|
|
var fourthOfJanuaryOfNextYear = new Date(0);
|
|
fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
|
|
fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
|
|
var startOfNextYear = (0, _index2.default)(fourthOfJanuaryOfNextYear);
|
|
var fourthOfJanuaryOfThisYear = new Date(0);
|
|
fourthOfJanuaryOfThisYear.setFullYear(year, 0, 4);
|
|
fourthOfJanuaryOfThisYear.setHours(0, 0, 0, 0);
|
|
var startOfThisYear = (0, _index2.default)(fourthOfJanuaryOfThisYear);
|
|
|
|
if (date.getTime() >= startOfNextYear.getTime()) {
|
|
return year + 1;
|
|
} else if (date.getTime() >= startOfThisYear.getTime()) {
|
|
return year;
|
|
} else {
|
|
return year - 1;
|
|
}
|
|
}
|
|
|
|
module.exports = exports.default; |