import { getISOWeekYear } from "https://deno.land/x/date_fns@v2.12.0/index.js";
Examples
// Which ISO-week numbering year is 2 January 2005?
var result = getISOWeekYear(new Date(2005, 0, 2))
//=> 2004
// Which ISO-week numbering year is 2 January 2005? var result = getISOWeekYear(new Date(2005, 0, 2)) //=> 2004