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

The setDayOfYear function from the date-fns library allows you to set the day of the year for a given date in JavaScript. The function takes two arguments: a date Date object and the day of the year, a number between 1 and 366.

Here's an example of how to use the setDayOfYear function in JavaScript:

index.tsx
const dateFns = require('date-fns');

const currentDate = new Date(); // create a new date object with the current date/time
const dayOfYear = 100; // set the day of the year to 100

const newDate = dateFns.setDayOfYear(currentDate, dayOfYear); // set the day of the year for the current date

console.log(newDate); // output the new date object with the updated day of the year
379 chars
9 lines

In this example, we first create a new Date object with the current date. We then set the dayOfYear variable to 100, indicating that we want to set the day of the year to the 100th day. We then call the setDayOfYear function from the date-fns library, passing in the current date object and the day of the year as arguments. The function returns a new Date object with the updated day of the year, which we store in the newDate variable. Finally, we log the newDate object to the console.