Out of desperation, I discovered that yuo can manipulate the date and time by sliding up and down in the blacked out area beneath the month and year selectors. Picture an odometer (which is how it is modeled) and slowly slide up or down, accordingly. You'll get it with some patience. And you can always edit it. Good luck!
I noticed a bug with the date field as well. I found a receipt dated 9/12/14, tried to enter it, then the system gave me a error stating that the entered receipt mileage is not greater than the last entered mileage.
I am like, I know that, but on 9/12 it was fine. The system did allow me to ignore the warning. So a possible work around? delete the last 3 to 5 fills, and re-enter them? (i though out the reciepts once I enter it.)