function getDateTime() { var now     = new Date();    var year    = now.getFullYear(); var month   = now.getMonth()+1;   var day     = now.getDate();    var hour    = now.getHours();
        var minute  = now.getMinutes();      var second  = now.getSeconds();    if(month.toString().length == 1) {       month = '0'+month;    }  if(day.toString().length == 1) {
             day = '0'+day; }    if(hour.toString().length == 1) {   hour = '0'+hour;   } if(minute.toString().length == 1) {          minute = '0'+minute;       }
        if(second.toString().length == 1) {   second = '0'+second;
        }      var dateTime = year+'/'+month+'/'+day+' '+hour+':'+minute+':'+second;      return dateTime; }  // example usage: realtime clock
		setInterval(function(){
        currentTime = getDateTime();
        document.getElementById("digital-clock").innerHTML = currentTime;
    }, 1000);