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

To use the differenceInCalendarQuarters function from the date-fns library in JavaScript, first you need to install the library by running:

index.tsx
npm i date-fns
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Next, import the function in your JavaScript file:

index.tsx
import { differenceInCalendarQuarters } from "date-fns";
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Finally, you can use the differenceInCalendarQuarters function to calculate the difference between two dates in calendar quarters:

index.tsx
const startDate = new Date(2021, 0, 1);
const endDate = new Date(2021, 11, 31);
const quartersDiff = differenceInCalendarQuarters(endDate, startDate);

console.log(quartersDiff); // Output: 3
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In the above example, we are calculating the number of calendar quarters between startDate and endDate. The function returns the difference in quarters, which is 3. The parameters are the end date and the start date respectively.

You can also use this function to calculate the difference between a date and the current date:

index.tsx
const someDate = new Date(2021, 5, 15);
const quartersToNow = differenceInCalendarQuarters(new Date(), someDate);

console.log(quartersToNow); // Output: 4
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This code calculates the number of calendar quarters between someDate and the current date. The function returns the difference in quarters, which is 4 in this case.