If you are talking about getting through the security line, you will have no problem. There is no way they know what flight is running when. They just want to see something that shows a flight today, or at least in next few hours, if they even look at that.

Almost all airlines (all major ones for sure) can issue new tickets at the gate, and if you have an e-ticket, you are all set anyways. One of the good things about an e-ticket is that you could in theory lose it between security and the gate and get a new one at the gate.

All this assumes the airport you going through accepts the e-ticket receipt at security, which most do most of the time. These people can change and make up new rules just about whenever they want.

DO NOT TRY TO USE LOGIC ON ANY OF THIS.