The "In the last" Days filter is not starting at midnight, it is starting at the current time.
Today is 4/11 11:06am
When I create my filter for CreationDate:
CreationDate is in the last 7 (Amount) Day (Unit)
It leaves out features created.
In the last 7 days: it shows 5 features on 4/4.
In the last 8 days: Now it shows 11 features created on 4/4.