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

To use the differenceInCalendarQuarters function from the date-fns library in TypeScript, you would first need to install the library using a package manager like npm:

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

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

const startDate = new Date('2022-01-01');
const endDate = new Date('2022-12-31');

const numQuarters = differenceInCalendarQuarters(endDate, startDate);
console.log(numQuarters); // Output: 3
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In this example, we import the differenceInCalendarQuarters function from the date-fns library, create two Date objects representing a start and end date, and then use the function to calculate the number of calendar quarters between the two dates. The result is then output to the console.

Note that the differenceInCalendarQuarters function returns the difference in full calendar quarters, so if the difference between the two dates is, for example, 2 months and 20 days, it will still count as one quarter.