Consider using a date utility library for better maintainability

As suggested in [PR #3762](https://github.com/airqo-platform/AirQo-api/pull/3762), in the [comment](https://github.com/airqo-platform/AirQo-api/pull/3762#discussion_r1816465493), @Baalmart requested to consider using a date utility library like `date-fns` or `moment.js` to improve readability and reduce potential bugs in date calculations.\n\nRequest from @Baalmart.