Here in Pa we have a Pa meridian map that we go by.It is in the book you get with your license.As an example in my area from Jan.6-12 you begin at 6:53 and end at 4:54 but I would according to the map add 20 min. to each time or 7:12 or 5:14. I have had game wardens stop me at my car at quitting time and left with a call of someone shooting after hours so their is no guessing in Pa.
I still think especally in the extended ML and Archery season that prime time for deer to come out is lost but you have to set some kind of standard or some guys would shoot till they couldn't see.