import getISOWeekYear from '../getISOWeekYear/index' ; import requiredArgs from '../_lib/requiredArgs/index' ; name category summary description param { Date | Number } dateLeft param { Date | Number } dateRight returns { Number } throws example export default function differenceInCalendarISOWeekYears ( dirtyDateLeft , dirtyDateRight ) { requiredArgs ( 2 , arguments ) ; return getISOWeekYear ( dirtyDateLeft ) - getISOWeekYear ( dirtyDateRight ) ; }