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

To use the differenceInCalendarWeeks function from the date-fns library in JavaScript, you need to follow these steps:

1. Import the differenceInCalendarWeeks function from the date-fns library:

index.tsx
import { differenceInCalendarWeeks } from 'date-fns';
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2. Call the differenceInCalendarWeeks function with two date arguments:

index.tsx
const date1 = new Date('2022-01-01');
const date2 = new Date('2022-01-15');

const difference = differenceInCalendarWeeks(date2, date1);

console.log(difference); // 2
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In the example above, the differenceInCalendarWeeks function is used to calculate the difference in calendar weeks between date1 and date2. The result is 2, because there are two entire calendar weeks between these two dates.

Note that the differenceInCalendarWeeks function only considers the calendar weeks between the two dates, and not the actual number of days between them. This means that if the two dates are less than a week apart, the function will return 0.