34 lines
1.2 KiB
JavaScript
34 lines
1.2 KiB
JavaScript
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import { getISOWeekYear } from "./getISOWeekYear.mjs";
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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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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param dateLeft - The later date
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* @param dateRight - The earlier date
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*
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* @returns The number of calendar ISO week-numbering years
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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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* const 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 function differenceInCalendarISOWeekYears(dateLeft, dateRight) {
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return getISOWeekYear(dateLeft) - getISOWeekYear(dateRight);
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}
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// Fallback for modularized imports:
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export default differenceInCalendarISOWeekYears;
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