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39 lines
1.6 KiB
39 lines
1.6 KiB
import getISOWeekYear from '../getISOWeekYear/index.js';
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import requiredArgs from '../_lib/requiredArgs/index.js';
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/**
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* @name differenceInCalendarISOWeekYears
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* @category ISO Week-Numbering Year Helpers
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* @summary Get the number of calendar ISO week-numbering years between the given dates.
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*
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* @description
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* Get the number of calendar ISO week-numbering years between the given dates.
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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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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* - The function was renamed from `differenceInCalendarISOYears` to `differenceInCalendarISOWeekYears`.
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* "ISO week year" is short for [ISO week-numbering year](https://en.wikipedia.org/wiki/ISO_week_date).
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* This change makes the name consistent with
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* locale-dependent week-numbering year helpers, e.g., `addWeekYears`.
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*
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* @param {Date|Number} dateLeft - the later date
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* @param {Date|Number} dateRight - the earlier date
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* @returns {Number} the number of calendar ISO week-numbering years
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* @throws {TypeError} 2 arguments required
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*
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* @example
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* // How many calendar ISO week-numbering years are 1 January 2010 and 1 January 2012?
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* var result = differenceInCalendarISOWeekYears(
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* new Date(2012, 0, 1),
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* new Date(2010, 0, 1)
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* )
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* //=> 2
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*/
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export default function differenceInCalendarISOWeekYears(dirtyDateLeft, dirtyDateRight) {
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requiredArgs(2, arguments);
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return getISOWeekYear(dirtyDateLeft) - getISOWeekYear(dirtyDateRight);
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} |