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

To use the startOfQuarter function from the date-fns library in JavaScript, first, you need to install the library using a package manager like npm or yarn. Here's an example using npm:

index.tsx
npm install date-fns
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Then, you can import the startOfQuarter function and use it to get the start date of the current quarter:

index.tsx
const { startOfQuarter } = require('date-fns');

const currentDate = new Date();
const startOfCurrentQuarter = startOfQuarter(currentDate);

console.log(startOfCurrentQuarter); // Output: 2021-04-01T00:00:00.000Z
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You can also pass a date as a string or a timestamp to the startOfQuarter function:

index.tsx
const { startOfQuarter } = require('date-fns');

const dateStr = '2021-02-15';
const startOfQuarter = startOfQuarter(new Date(dateStr));

console.log(startOfQuarter); // Output: 2021-01-01T00:00:00.000Z

const timestamp = 1609459200000; // January 1, 2021
const startOfQuarter = startOfQuarter(timestamp);

console.log(startOfQuarter); // Output: 2021-01-01T00:00:00.000Z
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In this example, we imported the startOfQuarter function from the date-fns library and used it to get the start date of the current quarter by passing the current date to the function. Finally, we printed the result to the console.

Note that the startOfQuarter function returns a Date object, which represents the start of the quarter.