Knight of Dusk and Dawn

If it isn't day or night as Knight of Dusk and Dawn enters the battlefield, it becomes day.
If the current date of the month is even, Knight of Dusk and Dawn's base power and base toughness are switched.
Whenever day becomes night or night becomes day, put a +1/+1 counter on Knight of Dusk and Dawn.
Whenever Knight of Dusk and Dawn deals combat damage, if it isn't day, it becomes day. Otherwise, it becomes night.
{x}{w}{w}{w}: Creatures target opponent control gain summoning sickness until end of turn