JavaScriptでカウントダウンを作る - Qiita

var endDate = new Date('2020/07/24 00:00:00'); var interval = 1000; function countdownTimer(){ var nowDate = new Date(); var period = endDate - nowDate ; var addZero = function(n){return('0'+n).slice(-2);} var addZeroDay = function(n){return('0'+n).slice(-3);} if(period >= 0) { var day = Math.floor(period / (1000 * 60 * 60 * 24)); period -= (day *(1000 * 60 * 60 * 24)); var hour = Math.floor(perio