// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults
function ckDate(y,m,d) {
    var di = new Date(y,m-1,d);
    if(di.getFullYear() == y && di.getMonth() == m-1 && di.getDate() == d){
        return true;
    }
    alert('入力された日付が正しくありません');
    return false;
}