69 lines
2.7 KiB
JavaScript
69 lines
2.7 KiB
JavaScript
"use strict";
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
exports.default = differenceInISOWeekYears;
|
|
|
|
var _index = _interopRequireDefault(require("../toDate/index.js"));
|
|
|
|
var _index2 = _interopRequireDefault(require("../differenceInCalendarISOWeekYears/index.js"));
|
|
|
|
var _index3 = _interopRequireDefault(require("../compareAsc/index.js"));
|
|
|
|
var _index4 = _interopRequireDefault(require("../subISOWeekYears/index.js"));
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
/**
|
|
* @name differenceInISOWeekYears
|
|
* @category ISO Week-Numbering Year Helpers
|
|
* @summary Get the number of full ISO week-numbering years between the given dates.
|
|
*
|
|
* @description
|
|
* Get the number of full ISO week-numbering years between the given dates.
|
|
*
|
|
* 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 `differenceInISOYears` to `differenceInISOWeekYears`.
|
|
* "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., `addWeekYears`.
|
|
*
|
|
* @param {Date|Number} dateLeft - the later date
|
|
* @param {Date|Number} dateRight - the earlier date
|
|
* @returns {Number} the number of full ISO week-numbering years
|
|
* @throws {TypeError} 2 arguments required
|
|
*
|
|
* @example
|
|
* // How many full ISO week-numbering years are between 1 January 2010 and 1 January 2012?
|
|
* var result = differenceInISOWeekYears(
|
|
* new Date(2012, 0, 1),
|
|
* new Date(2010, 0, 1)
|
|
* )
|
|
* //=> 1
|
|
*/
|
|
function differenceInISOWeekYears(dirtyDateLeft, dirtyDateRight) {
|
|
if (arguments.length < 2) {
|
|
throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
|
|
}
|
|
|
|
var dateLeft = (0, _index.default)(dirtyDateLeft);
|
|
var dateRight = (0, _index.default)(dirtyDateRight);
|
|
var sign = (0, _index3.default)(dateLeft, dateRight);
|
|
var difference = Math.abs((0, _index2.default)(dateLeft, dateRight));
|
|
dateLeft = (0, _index4.default)(dateLeft, sign * difference); // Math.abs(diff in full ISO years - diff in calendar ISO years) === 1
|
|
// if last calendar ISO year is not full
|
|
// If so, result must be decreased by 1 in absolute value
|
|
|
|
var isLastISOWeekYearNotFull = (0, _index3.default)(dateLeft, dateRight) === -sign;
|
|
var result = sign * (difference - isLastISOWeekYearNotFull); // Prevent negative zero
|
|
|
|
return result === 0 ? 0 : result;
|
|
}
|
|
|
|
module.exports = exports.default; |