score:3
Plans change. There will be no trouble if you arrive on the 20th of February or indeed on any other day during the period of validity.
As always, there could be trouble if any change in plans leads a country's officials to suspect fraud or other misrepresentation. Delaying a trip by five days is extremely unlikely to arouse such a suspicion. If such a suspicion does arise, a reasonable explanation for the delay will almost certainly dispel it.