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

To use the differenceInCalendarDays function from date-fns in JavaScript, first make sure to install the date-fns library using your preferred package manager:

index.tsx
npm install date-fns
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Then, import the differenceInCalendarDays function at the top of your JavaScript file:

index.tsx
import { differenceInCalendarDays } from 'date-fns';
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Finally, call the differenceInCalendarDays function with two Date objects as arguments to get the number of calendar days between the two dates:

index.tsx
const date1 = new Date('2021-01-01');
const date2 = new Date('2021-02-01');
const daysDiff = differenceInCalendarDays(date2, date1);

console.log(daysDiff); // Output: 31
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