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

To use the differenceInDays function from the date-fns library in TypeScript, you need to first install the library as a dependency in your project:

index.ts
npm install date-fns
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After that, you can import the function and use it in your TypeScript code like this:

index.ts
import { differenceInDays } from 'date-fns';

const date1 = new Date(2021, 9, 1); // October 1st, 2021
const date2 = new Date(2021, 9, 5); // October 5th, 2021

const difference = differenceInDays(date1, date2); // returns 4
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The differenceInDays function takes two Date objects as arguments and returns the difference in days between them as a number. If the first date is after the second date, the result will be negative.

Note that the date-fns library is written in JavaScript, so you can use it in both TypeScript and JavaScript projects.