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

To use the setDay function from the date-fns library in JavaScript, you first need to install it by running npm install date-fns in your terminal or command prompt. Then, you can import it in your code and use it as follows:

index.tsx
// import the setDay function from date-fns
import { setDay } from 'date-fns'

// create a date variable
const myDate = new Date('2021-01-01')

// set the day to Wednesday (3)
const newDate = setDay(myDate, 3)

// print the new date to the console
console.log(newDate) // Output: Wed Dec 30 2020 00:00:00 GMT-0500 (Eastern Standard Time)
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In this example, we import the setDay function from the date-fns library and create a new Date object with the value of January 1st, 2021. We then use the setDay function to set the day to Wednesday (represented by the number 3, with Sunday being 0), which returns a new Date object with the updated day. Finally, we log the new date to the console.