"Wat een dag" ("What a day") was the Dutch entry in the Eurovision Song Contest 1961, performed in Dutch by Greetje Kauffeld.
The song is sung from the perspective of a young woman experiencing love and generally finding the world to be a lovely place. She sings, for example, that "I have even picked some flowers unpunished/In the park across the street", lending credence to her belief that this is truly her day.
The song was performed sixth on the night, following Yugoslavia's Ljiljana Petrović with "Neke davne zvezde" and preceding Sweden's Lill-Babs with "April, April". At the close of voting, it had received 6 points, placing 10th in a field of 16.
It was succeeded as Dutch representative at the 1962 Contest by De Spelbrekers with "Katinka".