hahaha - I'm the oddball - I always do Sunday-Saturday since I started doing Project365/Project life in 2009. When the next month comes in during the week, I treat it as the same week... if there are more days that land in the current month, that month is the title... if more of the next month, I switch to the next month for the title. I usually have some kind of calendar on my pages that shows which week we are on.