3rd-Shifters - Diary Settings!

I too work 11pm to 7am. I log my food for the day starting with my breakfast (I usually eat it when I get home from work around 7:30am. I eat 6 times a day due to being diabetic (I eat 3 main meals, and 3 snacks). I have an open diary too and in my notes I put if I ate at home or work. I had problems doing the midnight to midnight. Being I eat till 5:45am while working. So it worked out better to do it the way I did. (this may not work for you though) Do what works for you. Where you feel one day ends and one day starts. The main thing is to be able to log your food without having high calories one day and 300 calories the next day etc. Keep it uniformed.