Christmas movies.. or are they?

[ShawnFuzz]

What is a Christmas movie? I think of movies like A Christmas Carol, Home Alone,  or A Christmas Story as obvious ones.

But...

My streaming services keep suggesting Die Hard and Gremlins. At what point is a movie considered a "Christmas movie"?

Is it a Christmas movie because it is centered around the holiday? Or does it just need to take place  during the holiday?