CCommunity
Number of odd days in 1999 = 1
Number of odd days from 1999 till 2000 = 1 + 2 = 3 odd days
Number of odd days from 1999 till 2001 = 3 + 1 = 4 odd days
Number of odd days from 1999 till 2002 = 4 + 1 = 5 odd days
Number of odd days from 1999 till 2003 = 5 + 1 = 6 odd days
Number of odd days from 1999 till 2004 = 6 + 2 = 8 odd days
Number of odd days from 1999 till 2005 = 8 + 1 = 9 odd days
Number of odd days from 1999 till 2006 = 9 + 1 = 10 odd days
Number of odd days from 1999 till 2007 = 10 + 1 = 11 odd days
Number of odd days from 1999 till 2008 = 11 + 2 = 13 odd days
Number of odd days from 1999 till 2009 = 13 + 1 = 14 odd days = 0 odd days
Hence, calendar of 1999 is similar to that of 2010.