Shows the difference between two dates. Paramenters are passed by query string:
- s : start date
- e : end date
- year month day (yyyy-mm-dd) i.e ?s=2021-06-01&e=2021-07-31 (output 60 days)
- month day year (mm-dd-yyyy) i.e ?s=06-01-2021&e=07-31-2021 (output 60 days)