I work for a place that has a small flock of RIR's and we sell eggs. But I just took over and noone is able to explain to me how to date the eggs using the julian calendar like we should be doing. How long should I make the "use-by date"? And how do I use the chart to do this. I have googled and googled and just am not coming up with the answer. Help! Our farmers market starts in a week!