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

To use the getQuarter function from the date-fns library in TypeScript, you first need to install the library:

index.ts
npm install date-fns
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Once you have installed the library, you can then import the getQuarter function and use it in your TypeScript code like this:

index.ts
import { getQuarter } from 'date-fns';

const date = new Date('2021-09-01');
const quarter = getQuarter(date); // will return 3
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The getQuarter function takes a Date object and returns the quarter of the year that the date falls in. In the example above, the date is set to September 1st, 2021, which is in the third quarter of the year, so quarter will be set to 3.

Note that because getQuarter is a named export from the date-fns library, you need to use destructuring assignment to import it. Alternatively, you could use the import * as dateFns from 'date-fns' syntax to import all of the date-fns functions and then use dateFns.getQuarter(date) to call the getQuarter function.