Plot hole: When they are on the subway train, they are talking about the worm and the virus. They said that everything would happen on the 14th. A couple of scenes later, when they are setting up for the traffic lights to go crazy at 9:00, Dade looks at his watch. You can see the date as 10-18, which is 4 days afterwards.
Plot hole: If Dade is 18, like we find out at the beginning of the movie when his mom says happy birthday, then his probation is over (the judge said "until the time of your 18th birthday") and the terms restricting computer and phone usage no longer apply. The threats by Secret Service about violating his probation are BS since he's not on probation anymore.