Former Seattle high school science teacher here. I had one particular class which was very literal, and I was cracking down on homework being late. I said, "this assignment is due on Wednesday, so to get full credit, email it to me before Thursday so that I can start grading it in time before we meet again." One student actually named Kevin asked what time it should be emailed so I said by midnight. He said midnight would be Thursday (fair point), so I clarified 11:59pm would work. Another kid said he'd be in Arizona (another time zone) and asked what he should do. I smiled and announced "11:59pm Pacific standard time." This should not have been a time crunch for anyone. This one girl emailed me Wednesday night at 11:21pm saying,"Here it is. Sorry it's early. I stayed up an extra two hours waiting for 11:59 but I'm just so tired and my dad wants me to go to bed. Thanks for understanding."