It actually took me a long time to get around to writing this post: no joke.
This random website proposes that a procrastinator experiences time like this:

Although that may technically be accurate, I don’t personally feel anything like a time distortion. Instead, I underestimate the number of tasks I want to complete (eg: packing a house) and the duration of each task. David Seah notes that procrastination can be caused by either a poor sense of time or an obsession with last-minute details. I suffer from a combination.
So although a clock based on the theory of time diagrammed above may work to increase my timeliness, it would have to be recalibrated for every deadline (things to do before I leave in the morning, things to do before coffee break, etc.). Seah has designed a much better clock: it runs fast by a random and always changing amount of time. Now I just need someone to implement it for the iPhone.
Jack
The trick there is that you’d need to replace the OS clock. I’m not sure that’s allowed — it’s Apple’s sandbox, they can opt not to let you play.