Do you actually care if the requests were made on some specific calendar day? Or do you just want to make sure that heavy users are paying more and/or people ar

Do you actually care if the requests were made on some specific calendar day? Or do you just want to make sure that heavy users are paying more and/or people aren't abusing your system? Instead of tying your quotas to calendar days in some specific time zone, tie them to a rolling 24 hour usage period. Even better: use a rolling hour.