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

To use the endOfSecond function from date-fns in JavaScript, you first need to install the package. You can do this using NPM or Yarn by running the following command:

# Using NPM
npm install date-fns

# Using Yarn
yarn add date-fns
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Once you have the package installed, you can import the endOfSecond function and use it in your code like this:

index.tsx
// Importing the endOfSecond function
const { endOfSecond } = require('date-fns');

// Using the function
const date = new Date(2021, 5, 25, 10, 30, 15);
const endOfSecondDate = endOfSecond(date); // returns 2021-06-25T10:30:15.999Z
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The endOfSecond function takes a JavaScript Date object or a timestamp as its argument and returns a new Date object with the last millisecond of the second set to 999. You can use this function to get the end of a second for a given date or timestamp.