SOURCE

function dateFormat(date,type){
    var Year = date.getFullYear(),
        Month = date.getMonth() + 1,
        _Month = Month.toString().replace(/^(\d)$/,'0$1'),
        Day = date.getDate(),
        _Day = Day.toString().replace(/^(\d)$/,'0$1'),
        Hours = date.getHours(),
        _Hours = Hours.toString().replace(/^(\d)$/,'0$1'),
        Minutes = date.getMinutes(),
        _Minutes = Minutes.toString().replace(/^(\d)$/,'0$1'),
        Seconds = date.getSeconds(),
        _Seconds = Seconds.toString().replace(/^(\d)$/,'0$1');
    var date = type.replace(/y+/gi,Year)
        .replace(/M{2,}/,_Month).replace(/M/,Month)
        .replace(/d{2,}/g,_Day).replace(/d/g,Day)
        .replace(/h{2,}/g,_Hours).replace(/h/,Hours)
        .replace(/m{2,}/,_Minutes).replace(/m/,Minutes)
        .replace(/s{2,}/g,_Seconds).replace(/s/,Seconds);
    return date;
}

var text;
text = dateFormat(new Date() ,'yyyy/MM/dd hh/mm/ss');
$('#main').append(`${text}<br>`)
text = dateFormat(new Date() ,'yyyy-MM-dd hh:mm:ss');
$('#main').append(`${text}<br>`)
text = dateFormat(new Date() ,'hh:mm');
$('#main').append(`${text}<br>`)

<div id="main"></div>