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

The getOverlappingDaysInIntervals function from the date-fns library is used to calculate the number of days between two date intervals that overlap.

Here is an example of how to use getOverlappingDaysInIntervals function in JavaScript:

index.tsx
const { getOverlappingDaysInIntervals } = require('date-fns');

const interval1 = { start: new Date('2021-01-01'), end: new Date('2021-01-15') };
const interval2 = { start: new Date('2021-01-10'), end: new Date('2021-01-20') };

const overlappingDays = getOverlappingDaysInIntervals(interval1, interval2);
console.log(overlappingDays); // Output: 6
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In this example, we import the getOverlappingDaysInIntervals function from the date-fns library using object destructuring. Then, we create two date intervals using the Date constructor.

After that, we call the getOverlappingDaysInIntervals function with the two intervals as arguments. The function returns the number of days that overlap between the two intervals, which is 6 in this case.

Finally, we log the result to the console.

Note that getOverlappingDaysInIntervals function returns a negative number if the two intervals don't overlap.