The calendar for the year 2002 is the same as for the year

Count the number of odd days from the year 2002 onwards to get the sum equals to 0 odd day.
Years 2002 2003 2004 2005 2006 2007
Odd days 1 1 2 1 1 1
Sum = 7 odd days = 0 odd day
Calender for the year 2008 is the same as that for the year 2002.