matlab classifying as daytime or nighttime, and making graph daytime

1) I’d like to classify the marine accidents as daytime or nighttime based on the accident time comparing to the civil twilight time(from civil dawn time to civil dusk time). Generaaly, Daytime is from sunrise to sunset. But, in my research, I will define the daytime is from civil dawn to civil sunset. I already have the matlab function gettting the civil twilight. please classify the whole data as daytime or nighttime using Matlab script. 2) Graph showing the time of sunrise (red line) and sunset (blue line) for each day of the year. I’d like to get the graph of civil twilight such like following figure at an certain position.