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

To use the startOfHour function from the date-fns library in JavaScript, first, you need to install the date-fns package via npm. Here is the command-line instruction to install the package:

index.tsx
npm i date-fns
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Then, you can import the startOfHour function from the date-fns package and use it in your JavaScript code like this:

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

const date = new Date();
const startHour = startOfHour(date);

console.log(startHour); // the start of the current hour
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The startOfHour function takes a Date object as an argument, and returns a new Date object with the time set to the start of the hour. For example, if the input time is 2021-06-11T13:30:00.000Z, the returned time will be 2021-06-11T13:00:00.000Z.