If the frequency capping bound to the current day?
In general, the FC always apply from the first view. Thus, an FC 3 / hour means that from the first View one hour set. Within the hour two more views can happen. Is the hour expired can follow, etc. The day is irrelevant 3 other views. An FC 1/24 is triggered at 23:55, that is valid until the next day at 23:55.