Travel Credit resets on card opening anniversary. 保险一点的话再过一天开始用。
P1 P2 都是月底开卡，账单日不同，好像是看运气吧。
P1: 1/24 开卡
Stmt close 2nd-5th
Payment due 1st (固定的）
AF = Stmt close date 1/2-1/5
TC resets 1/24
Payment due 2/1
P2: 6/25 开卡
Stmt close 17-20th
Payment due 16th (固定的）
AF = Stmt close date 6/17-6/20
TC resets 6/25
Payment due 7/16