import { getISOWeekYear } from "./getISOWeekYear.mjs"; /** * @name differenceInCalendarISOWeekYears * @category ISO Week-Numbering Year Helpers * @summary Get the number of calendar ISO week-numbering years between the given dates. * * @description * Get the number of calendar ISO week-numbering years between the given dates. * * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date * * @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). * * @param dateLeft - The later date * @param dateRight - The earlier date * * @returns The number of calendar ISO week-numbering years * * @example * // How many calendar ISO week-numbering years are 1 January 2010 and 1 January 2012? * const result = differenceInCalendarISOWeekYears( * new Date(2012, 0, 1), * new Date(2010, 0, 1) * ) * //=> 2 */ export function differenceInCalendarISOWeekYears(dateLeft, dateRight) { return getISOWeekYear(dateLeft) - getISOWeekYear(dateRight); } // Fallback for modularized imports: export default differenceInCalendarISOWeekYears;