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I hope this question is alright to ask here. I am trying to make an algorithm that counts how many days between 2 dates. For example, 3/1/2012 and 3/2/2012. Whats the correct answer, or the most popular choice, and should be the one I use? So in this case, if I don't include both dates I am comparing, its 0. If I include one of them (both the start date), its 1. Lastly, if I include both, its 2. Thanks.

I am trying to make an algorithm that counts the days between two dates, e.g. between 3/1/2012 and 3/2/2012.

What is the correct answer, or the most popular choice? Should be the one I use?

In this case, if I don't include both dates I am comparing, the days are 0; if I include one of them, the days are 1; if I include both, the days are 2.