Use moment().format(h:mm:ss) that returns time in a h:mm:ss format.

var midnight = 0:00:00;

var now = null;



setInterval(function () {

    now = moment().format(H:mm:ss);

    if (now === midnight) {

        alert(Hi);

    }

    $(#time).text(now);

}, 1000);

JSFIDDLE

A better way would be to compute the seconds until midnight. This is very simple and human readable using MomentJS:

// returns the number of seconds until next midnight

moment(24:00:00, hh:mm:ss).diff(moment(), 'seconds');

So, just do:

setTimeout(

   midnightTask,

   moment(24:00:00, hh:mm:ss).diff(moment(), 'seconds')

);



function midnightTask() {

  /* do something */

}

JSFIDDLE