We already have code to compute days from ticks efficiently, so let's use it.
We already have code to compute days from ticks efficiently, so let's use it.

malcolmr/nodatime,jskeet/nodatime,zaccharles/nodatime,zaccharles/nodatime,BenJenkinson/nodatime,nodatime/nodatime,malcolmr/nodatime,malcolmr/nodatime,zaccharles/nodatime,zaccharles/nodatime,BenJenkinson/nodatime,nodatime/nodatime,malcolmr/nodatime,jskeet/nodatime,zaccharles/nodatime,zaccharles/nodatime