javascript current date time

1var today = new Date();
2var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
3

1var today = new Date();
2var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
3var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
4var dateTime = date+' '+time;
5

1var today = new Date();
2var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
3//var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
4var dateTime = date+' '+time;
5The dateTime variable contains result as:
6
72018-8-3 //11:12:40

1    new Date().toLocaleString();
2
3>> "09/08/2014, 2:35:56 AM"
4

1var today = new Date().toLocaleDateString(undefined, {
2    day: '2-digit',
3    month: '2-digit',
4    year: 'numeric',
5    hour: '2-digit',
6    minute: '2-digit',
7    second: '2-digit'
8})
9

1function getDateTime() {
2        var now     = new Date(); 
3        var year    = now.getFullYear();
4        var month   = now.getMonth()+1; 
5        var day     = now.getDate();
6        var hour    = now.getHours();
7        var minute  = now.getMinutes();
8        var second  = now.getSeconds(); 
9        if(month.toString().length == 1) {
10             month = '0'+month;
11        }
12        if(day.toString().length == 1) {
13             day = '0'+day;
14        }   
15        if(hour.toString().length == 1) {
16             hour = '0'+hour;
17        }
18        if(minute.toString().length == 1) {
19             minute = '0'+minute;
20        }
21        if(second.toString().length == 1) {
22             second = '0'+second;
23        }   
24        var dateTime = year+'/'+month+'/'+day+' '+hour+':'+minute+':'+second;   
25         return dateTime;
26    }
27
28    // example usage: realtime clock
29    setInterval(function(){
30        currentTime = getDateTime();
31        document.getElementById("digital-clock").innerHTML = currentTime;
32    }, 1000);