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

To use the differenceInIsoWeekYears function from the date-fns library, you first need to install the library. You can do this by running the following command in your terminal:

npm install date-fns
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After installing the library, you can import the differenceInIsoWeekYears function in your JavaScript file as follows:

index.tsx
import { differenceInIsoWeekYears } from 'date-fns';
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Alternatively, you can also require the function using the following code:

index.tsx
const { differenceInIsoWeekYears } = require('date-fns');
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The differenceInIsoWeekYears function takes in two arguments - the start date and the end date. These dates should be passed as JavaScript Date objects or as date strings in the format YYYY-MM-DD.

Here is an example usage of the differenceInIsoWeekYears function:

index.tsx
const start = new Date('2014-01-01');
const end = new Date('2021-12-31');

const diffInIsoWeekYears = differenceInIsoWeekYears(end, start);

console.log(diffInIsoWeekYears);
// Output: 8
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In the above example, the differenceInIsoWeekYears function calculates the difference between the start date (2014-01-01) and the end date (2021-12-31) in terms of ISO week years, which gives the output 8.