Although Christmas Day is always celebrated on the 25th of December, the day of the week that this date falls on varies from year to year, as shown in the list given below.
2012 (Leap year): Tuesday
2016 (Leap year): Sunday
2020 (Leap year): Friday
2024 (Leap year): Wednesday
When Christmas Day happens to be on the weekend, a different day may be officially allocated as a public holiday, depending on where in the world you live.