Passage: In Denmark and Norway, February 14 is known as Valentinsdag, and it is celebrated in much the same manner as in the United Kingdom. In Sweden it is called Alla hjärtans dag ("All Hearts' Day") and is not widely celebrated. A 2016 survey revealed that less than 50% of men and women were planning to buy presents for their partners. The holiday has only been observed since the 1960s.

Question: What is February 14th known as?
Valentinsdag