Another central Jersey (school librarian) here. We also had only one day and kids end on 6/12. But, to comment on the original post, once I played hookey to be in Disney in December, and we had a snow day, so I didn't have to take my one day off. I was walking around in shorts while the school closed, and I found that very amusing, though I must admit that I didn't when they had to de-ice the plane twice!
Also, I'm in a private school and the students must attend 180 days; our calendar is 189 days due to in-service, etc.