The time of day you workout should have no bearing on your carbohydrate intake.
I generally workout around this time (8:45pm EST) and trust me, even when dieting down I eat plenty of carbs during/post workout.
In terms of P + C after HIIT, I think it would generally be a good idea to have a pure whey shake with some simple carbs (maybe not a 2:1 or 3:1 ratio), but a piece of fruit, e.g. banana.
I'm sure some of the other guys can give you a good insight on their HIIT PWO nutrition because I generally only do low-moderate intensity cardio.