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

To use the startOfSecond function from the date-fns library in Javascript, you need to install date-fns first using npm.

npm install date-fns
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After you've installed the package, you can import the startOfSecond function to your code and use it to get the start of a second for a given date or timestamp.

index.tsx
import { startOfSecond } from 'date-fns';

const date = new Date();
const startOfSecondDate = startOfSecond(date);

console.log(startOfSecondDate); // returns a Date object representing the start of the second for the input date
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The startOfSecond function takes a date or timestamp as its parameter and returns a new Date object representing the start of the second for the given input. If you pass in a timestamp, startOfSecond will convert it to a Date object first.

Note that the startOfSecond function sets the milliseconds to 0 to represent the start of the second.