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

You can use the setWeekYear function from date-fns to set the week-year of a given date.

Here's an example code snippet that demonstrates how to use the setWeekYear function in JavaScript:

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

const date = new Date('2021-12-31');

const weekYear = 2022;

const newDate = setWeekYear(date, weekYear);

console.log(newDate); // Output: 2022-01-02T00:00:00.000Z
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In this example, we first import the setWeekYear function from the date-fns library using the require method. We then create a new Date object for the last day of 2021. We set the weekYear variable to 2022, which is the year we want to set the date to. We then call the setWeekYear function with the date and weekYear variables as arguments to get a new date object for the first day of the week-year 2022. Finally, we log the new date object to the console.

This is just one example of how you can use the setWeekYear function in JavaScript. There are many other ways to use this function depending on your specific use case.