I am making a website where if a user logs in, the user is

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Asked: June 12, 20262026-06-12T00:27:14+00:00 2026-06-12T00:27:14+00:00

I am making a website where if a user logs in, the user is

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I am making a website where if a user logs in, the user is given a certain logout time, where the logout time is defined and the timeleft is obtained from the logout time – server time.

I’ve already got the logout time and server time via PHP, but I want to display the time left dynamically thus requiring Javascript. I’ve tried using the following code:

function timerStart(arg1, arg2){
    var counter = setInterval(function() {getTimeLeft(arg1,arg2); }, 1000);
}

function getTimeLeft(arg_endtime, arg_currenttime){
    var endtime = new Date(arg_endtime);
    var curtime = new Date(arg_currenttime);

    var timeleft = new Date(endtime - curtime); //endtime - curtime;

    tlHours = timeleft.getHours();
    tlMinutes = timeleft.getMinutes();
    tlSeconds = timeleft.getSeconds();

    document.getElementById("timeleft").value = tlHours + ":" + tlMinutes + ":" + tlSeconds;

}

Where arg1’s value is ‘2011:10:11 17.30.00’ and arg2’s value is ‘2011:10:11 15:55:31’ as a string (yes, they are in different format). But when I tried the above codes I get NaN:NaN:NaN. I am very new to Javascript (3 days) and trying to catch up a deadline so a thorough explanation is very appreciated.