DateTime calculate fine
<p>Hi I'm wondering whats the best way to do this task!</p>

<p>If have three DateTimes objects named TimeOfLoan, DueDate and TimeOfReturn and if the days between TimeOfLoan and DueDate is over 15 days I want to give a fine for every day that passed before it is returned. Like first day 10 euro second day 10 euro etc.</p>
