I worked from home for 2 days in December that was approved by my superiors, actually they asked me to do it. Mind you, I was at home sick for those days. Since I was working, I didn't think that I needed to take those days as vacation. Today, my superiors let me know that they will not honor those days as work days and I must take vacation time for those dates. I thought this sounded a little odd, but wanted to get a second opinion.