On Thu, Mar 27, 2014 at 10:56 PM, Skip Montanaro <skip at pobox.com> wrote: > There are, > as I see it, two common cases where t is negative: > > -1 day < t < 0 > > and > > t <= -1 day There are two types of negative numbers: Those closer to zero than -1, and those not closer to zero than -1. Yeah, I think those are the most common cases. :) ChrisA