CCommunity
Christmas falls on December 25th of every year.
Since 2012 is a leap year, there are 366 days between December 25th of 2011 and December 25th of 2012.
When 366 is divided by 7, the remainder is 2, ie., 2 more days after Sunday.
So if December 25th of 2011 was on Sunday, December 25th of 2012 will be on Tuesday.