Christmas Day and New Year's Day. I take vacation time to cover school vacation and DD also spends an overnight with my mom and dad to help me keep vacation time to a minimum.
Our company has Dec 24th, 25th, 31st, and Jan 1st.
However, the NOC and service desk needs to be manned 24/7. So although it's a company holiday, we need to take turns working.
I'm so far working Christmas morning 8-12. Not sure about New Years yet.
My office is closed on 12/24, 12/25 and 12/26 for Xmas and again on 12/31, 1/1 and 1/2 for New Year's.
My boss always cooks a big family meal for holidays, so we usually always get the day before off. And he hates to come in on the day after, so we usually get that day off too.