> From a legal perspective, the time written on the policy doc is inclusive - we can't just decide that we want it to be exclusive because it suits our purposes

> From a legal perspective, the time written on the policy doc is inclusive - we can't just decide that we want it to be exclusive because it suits our purposes. Well, apparently it's not if it's understood that it covers leap seconds as well. With regard to the internal modeling, I always go for half-open intervals, where the open side depends on the data being modeled, they have much nicer mathematical properties than closed intervals.