Eddie, welcome! I don't know that you can do what you want, perhaps someone else has a workaround or knows how.
If you have a good idea of your calorie intake and burn you can set a realistic goal simply by keeping in mind that it takes on average a 3,500 calorie deficit to eliminate one pound of fat. Thus, if you are running a 1,000 calorie per day deficit you should, on average, lose two pounds a week. So, with this in mind, getting a weight/date goal shouldn't be a problem.
Of course, the human body does not always follow the math, but over time it should be pretty close. The more accurate your estimate of intake and burn are, the more closely your results will match the prediction.
Hope this helps!
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.