Half hours / 15 Minutes time loop in Javascript / jQuery

        var x = 30; //minutes interval
        var timesarr = []; // time array
        var tt = 0; // start time
        var ap = ['AM', 'PM']; // AM-PM
        //Loop to increment the time and push results in times array
        for (var i=0;tt<24*60; i++) {
          var hh = Math.floor(tt/60); // getting hours of day in 0-24 format
          var mm = (tt%60); // getting minutes of the hour in 0-55 format
          timesarr[i] = ("0" + (hh % 12)).slice(-2) + ':' + ("0" + mm).slice(-2) + ' ' + ap[Math.floor(hh/12)]; // pushing data in array in [00:00 - 12:00 AM/PM format]
          tt = tt + x;
        }
        console.log(timesarr);