What if you had a clock to tell you exactly when important things in your life were going to happen? When you'd finally reach a goal you've had for years? When you'll... meet your true love?
Nightmare Moon's about to return and Equestria needs a savior, but don't worry: Celestia's got everything under control. Just as long as Twilight goes to Ponyville on time, and not to Moondancer's party instead--but why would she ever do that?