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

To use the startOfQuarter function from the date-fns library, you first need to install the library and import the function into your Typescript file.

index.ts
import { startOfQuarter } from 'date-fns';
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The startOfQuarter function takes a date as its argument and returns the start of the quarter that the date belongs to.

Here is an example usage of the function:

index.ts
const date = new Date('2022-07-22');
const startOfQuarter = startOfQuarter(date); // Returns the start of the Q3 2022 quarter
console.log(startOfQuarter); // Output: Mon Jul 01 2022 00:00:00 GMT-0400 (Eastern Daylight Time)
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In the above example, we create a Date object for July 22, 2022 and pass it as an argument to the startOfQuarter function. The function returns the start of the third quarter of 2022, which is July 1, 2022.

Note that startOfQuarter returns a new Date object and does not modify the original date object.