how to use the getisoday function from the date-fns library in typescript

To use the getISOWeek function from the date-fns library in TypeScript, you first need to install the library and its type definitions:

npm install date-fns
npm install -D @types/date-fns
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Once you have installed the library, you can import the getISOWeek function and use it like this:

index.ts
import { getISOWeek } from 'date-fns'

const date = new Date('2021-10-08')

const isoWeek = getISOWeek(date)

console.log(isoWeek) // Output: 40
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In the code snippet above, we import the getISOWeek function from the date-fns library and pass a Date object to it. The getISOWeek function returns the ISO week of the year for the specified date.

We then log the isoWeek variable to the console, which outputs 40 as the ISO week number for October 8th, 2021.