code: public void setYear(String newYear)
  	{
  		if (newYear.length() > YEAR_SIZE)
  		{
  			year = newYear.substring(0, YEAR_SIZE);
  		}
  		else
  		{
  			year = newYear;
  		}
  	}
docs: Set the year field of the tag.  The maximum size of the String is 4.
  If the size exceeds the maximum size, the String will be truncated.
  
  @param newYear the year for the tag