JavaScript function to detect interval (1, 2, 3, ... seconds) using operating system internal clock.

DetectChangeInTSecond.js

// Function to detect if x second is already passed.
// If each tick is more than 1 second then this
// function is screwed, but that will not happen
// (hopefully).
function DetectChangeInTSecond(_t, _date){

    this.t               = _t;
    this.currSecond      = _date.getSeconds();
    this.currSecondPrev  = this.currSecond;
    this.counter         = 0;
    this.xSecondPassed   = false;

}
DetectChangeInTSecond.prototype.Update = function(_date){

    this.currSecond = _date.getSeconds();
    if(this.currSecond != this.currSecondPrev){

        this.counter ++
        this.currSecondPrev = this.currSecond

    }
    else{ this.xSecondPassed = false; }

    if(this.counter >= this.t){

        this.counter        = 0
        this.xSecondPassed  = true;

        console.log(this.t + " second(s) has passed")

    }

    return this.xSecondPassed;

}

function Main(){

    var currDateTime = new Date();
    var dCITS1       = new DetectChangeInTSecond(1, currDateTime);
    var dCITS3       = new DetectChangeInTSecond(3, currDateTime);
    while(true){

        currDateTime = new Date();
        dCITS1.Update(currDateTime);
        dCITS3.Update(currDateTime);

    }

}

Main()