This is the most complete answer I found on the about reputation.
You can read:
Reputation "lost" from the reputation cap is not awarded on following days.
What about the same day ?
Let's say that:
- I cap with a +30 Answer A
- A few minutes later I gain another +30 for an Answer B (which is swallowed by the cap)
- My Answer A get's deleted
- I'm now under the cap again and have a 30 rep hole to reach the cap again.
Do I get the reputation that I should have got for Answer B since I'm in the same day ?