Giorni trascorsi tra due date

DiffDate allows you to calculate the number of days that have passed between two dates. It is sufficient, with a long tap on the dates, to enter the start and end date.
For the calculation, both the calendar year is used, i.e. the year made up of 365 days, as it actually is, with the actual calendar days taking into account the months made up of 30, 31 or 28/29 days, and the commercial year, which, by convention, is made up of months of 30 days. The commercial year, therefore, appears to be made up of 360 days. In the calculation, the exclusion or not of the starting date can be optioned.