### getDaysDiffBetweenDates

Returns the difference (in days) between two dates.

Calculate the difference (in days) between two `Date` objects.

```js
const getDaysDiffBetweenDates = (dateInitial, dateFinal) => (dateFinal - dateInitial) / (1000 * 3600 * 24);
// getDaysDiffBetweenDates(new Date("2017-12-13"), new Date("2017-12-22")) -> 9
```