[Solved] Javascript check time difference

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I’m not sure to understand what you want, but if you want to find out how long the button was pressed, there is how to do it.

var btn = document.getElementById('btn');
var timeStamp = Date.now();

btn.addEventListener('mousedown', function(){
    timeStamp = Date.now();
});
btn.addEventListener('click', function(){
    var t = Date.now() - timeStamp;
    /*You could add a condition to check the time here.*/
    document.getElementById('mssg').innerHTML = 
        "Mouse was hold " + t + " ms !";
});
<input type="button" id="btn" value="Click and hold" />
<span id="mssg"></span>

Else, if you want to make something happend after a certain amount of time, here is how to do that : 

var btn = document.getElementById('btn');
btn.onclick = function(){
    alert('Hello !');
};
var remainingSeconds = 5;
var interval = setInterval(function(){
    remainingSeconds--;
    if(remainingSeconds > 0){
        btn.value="Wait (" + remainingSeconds + ' sec left)';
    }
    else{
        clearInterval(interval);
        btn.disabled = false;
        btn.value="You can now click";
    }
}, 1000);
<input type="button" id="btn" value="Wait" disabled>

I hope, I could help ! Please be more precise in your questions in the future !

solved Javascript check time difference