I have googled this every way I could think of, and couldn't find an answer. Kind of silly question, but here goes... Given our schedules, my husband and I are pretty much night owls. By the time we are going to bed it's usually anytime after 2 or 3 a.m. So when we BD it's usually somewhere around those hourse. My problem has always been being confused about what day to mark it down as. For instance... We went to bed last night around 2 (a.m.) and BDed about around 2:30 or so. When I charted it today, it didn't know whether to mark it down as for the 30th, or the 31st. I know "technically" it's the 31st, but this is always our schedule. Since it's at this time do you think it even really matters what day it's marked as?