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int numberOfDays;  
if (month == 4 || month == 6 || month == 9 || month == 11)  
  numberOfDays = 30;  
else if (month == 2)  
{ 
  bool isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);  
  if (isLeapYear)  
    numberOfDays = 29;  
  else  
    numberOfDays = 28;  
}  
else  
  numberOfDays = 31;