Timing the purchase of TIW card

[DisMN]

We arrive 1/31 and are planning to buy the TIW card. I know though that it's expiration date isn't the typical 12 month scenario. I'm not entire sure what the extention is though and what would the ideal purchase date be, Jan 31 or wait until Feb 1?

Any info would be helpful. Thanks!

ETA We're only planning to do the TIW due to the fact that they've finally added a bunch of new restaurants to the list...finally...additions instead of removals. YAY! LOL