case 3: if(day==20) return year == 2008 || year == 2009 || year == 2012 || year == 2013 || year == 2016 || year == 2017; //2008,9年は20日が春分 else if(day==21) return year == 2006 || year == 2007 || year == 2010 || year == 2011 || year == 2014 || year == 2015;