This is probably due to the interesting CPDN credit exports of the past few days. I gained 80K+ credits in a credit export mishap. Those credits were deducted in the last xml export.

The goal I have in the total credit calculator is 1,000,000. I have (as of the daily) 922,645.90 credits.

The calculator says "Target will be reached in -6.93 days on June 27 2008"

Since your last days credit is very large negatively, you have a negative credit-rate, so the calculator assumes you have reached your goal in the past. Though mathematically correct, it seems to make more sense to add a check "if credit-rate < 0, then target can't be reached".