Hi Kate!
I'm happy to help you out with your planning question and thanks for visiting us! The 180-day calculator is down to the exact day, so as of today (8/9/13), reservations are only available on the system through February 5th. In other words, if you're traveling later in the month, you'll need to wait until the exact date of 180 days prior. There are many handy independent sites willing to calculate for you ... just google "Disney 180-day calculator" and you'll soon find a few helpful resources.
If you are traveling the first few days of February, I'm providing you the link to
T-REX online Advanced Dining Reservations for reference. You can also give Disney Dining a call at 407-WDW-DINE, 407-939-3463, if you'd prefer to speak with a Cast Member.
Wishing you a magical vacation, Kate, and feel free to send us any other questions coming to mind.
Sherri