Seventh-day Adventists do not celebrate Christmas. They do not celebrate any religious holidays or festivals. The only time that Seventh-day Adventists set apart as holy is the weekly Sabbath, which occurs from Friday at sunset to Saturday at sunset.
One reason that Seventh-day Adventists cite when explaining why they do not celebrate Christmas is that the date of December 25 has no biblical basis. They also do not celebrate Christmas because they believe that Christmas is a holiday that encourages materialism and consumption. While Seventh-day Adventists do not officially celebrate religious holidays, they do use holidays to focus on biblical messages.