$Records->bindParam("i", "".$_POST['selYear'] ."", "2015-1-1"); //targetYear
$Records->bindParam("i", "".$_POST['selYear2'] ."", "2016-1-1"); //targetYear2
have the data type set to integer, that is what the i in the first argument stands for.
edit those 2 variables and set the data type to date.