var systs=1743674494161

// unix timestamp
//var ts = 1565605570;

var diffts = (new Date()) - systs;

// convert unix timestamp to milliseconds
//var ts_ms = ts * 1000;
// initialize new Date object
function sysTime(diffts){
    var localts = (new Date())-diffts;
    var date_ob = new Date(localts);

    // year as 4 digits (YYYY)
    var year = date_ob.getFullYear();
    // month as 2 digits (MM)
    var month = ("0" + (date_ob.getMonth() + 1)).slice(-2);
    // date as 2 digits (DD)
    var date = ("0" + date_ob.getDate()).slice(-2);
    // hours as 2 digits (hh)
    var hours = ("0" + date_ob.getHours()).slice(-2);
    // minutes as 2 digits (mm)
    var minutes = ("0" + date_ob.getMinutes()).slice(-2);
    // seconds as 2 digits (ss)
    var seconds = ("0" + date_ob.getSeconds()).slice(-2);

    // YYYY-MM-DD 
    var fulldate = "" + year + "-" + month + "-" + date;
    // hh:mm:ss
    var fulltime = "" + hours + ":" + minutes+ ":" +seconds;
    // YYYY-MM-DD hh:mm:ss 
    var fulldatetime = fulldate + " " + fulltime;
    return fulltime;
}

var intervalID = setInterval(function() {
    //document.title = sysTime(diffts);
    document.getElementById("clockts").innerHTML  = "Linux Time: " +sysTime(diffts);
}, 1000);