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1.  Introduction
  In this chapter, We deal with problems on finding the day of a week on a particular given date, The process of finding it lies on obtaining the number of odd days.
2.  Odd days
Number of days more than the complete number of weeks in a given period is the number of odd days during that period.
3.  Note
 
  A.   1 ordinary year = 365 days = (52 weeks + 1 day)    
  B.   I leap year = 366 days = 52 weeks  + 2 days    
  Hence an ordinary year has 1 odd day and a leap year has 2 odd days.    
  C.   100 years contain 5 odd days    
  D.   200 years contain 3 odd days    
  E.   300 years contain 1 odd day    
  F.   400 years contain no odd day    
  G.   Similarly, 800, 1200, 1600, 2000 … etc contains no odd day