how to use the getisoweekyear function from date-fns in javascript

You can use the getISOWeekYear() function from the date-fns library in JavaScript to get the ISO week-numbering year of a given date.

Here's an example code snippet that shows how to use the getISOWeekYear() function to get the ISO week-numbering year of today's date:

index.tsx
const { getISOWeekYear } = require('date-fns');

const today = new Date();
const isoYear = getISOWeekYear(today);

console.log(`The ISO week-numbering year of today's date is ${isoYear}.`);
190 chars
7 lines

This will output:

index.tsx
The ISO week-numbering year of today's date is 2021.
53 chars
2 lines

In the example, we first import the getISOWeekYear function from the date-fns library. We then create a new Date object with today's date and pass it to the getISOWeekYear() function to get its ISO week-numbering year. Finally, we log the result to the console.