var date = new Date("2020/1/1");
var countDownDate = date.getTime();
var target = document.getElementById('countdown');
target.style.fontSize = '72px';
var countDown = function(){
var now = new Date().getTime();
var distance = countDownDate - now;
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60))
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
var val =
days + "日 " +
hours + "時間 "+
minutes + "分 " +
seconds + "秒 ";
target.textContent = val;
}
$(function(){
var updateTargetDate = function(){
var name = $(this).attr('name');
var y = Number($('[name="year"]').val());
var m = Number($('[name="month"]').val());
var d = Number($('[name="date"]').val());
var dateFormat = [y, m, d].join('/');
date = new Date(dateFormat);
countDownDate = date.getTime();
}
$('input').on('change', function(){
updateTargetDate();
});
updateTargetDate();
countDown();
var x = setInterval(function() {
countDown();
}, 1000);
})