Exh pays maintenance for Dd monthly. He calculated it and we don't go through csa. He's got a new job where his payday has changed from 10th to 30th of the month. So he paid me last on 10th Oct and has said he doesn't need to pay now until 30th Nov. So I have asked whether he will be paying 7 weeks worth as that's how long it is between payment dates. He says he doesn't have to because its still a monthly payment it's just on a different date.
AIBU to think he does need to pay the 7 weeks worth?