How to create a timer (chronometer) in Adobe Animate

see if this code helps.

var book_release_date = new Date(2019,6,1);  // for july, not june, 1st 2019 release date.

createjs.Ticker.addEventListener('tick',tickF.bind(this))

function tickF(e){

this.tf.text = formatF(book_release_date.getTime()-new Date().getTime());

}

function formatF(ms){

var days = Math.floor(ms/(1000*60*60*24));

ms -= days*1000*60*60*24;

var hours = Math.floor(ms/(1000*60*60));

ms -= hours*1000*60*60

var min = Math.floor(ms/(1000*60));

ms -= min*1000*60;

var sec = Math.floor(ms/1000);

return ' '+padF(days)+'  '+padF(hours)+'  '+padF(min)+'  '+padF(sec);

}

function padF(n){

var s=n.toString();

while(s.length<2){

s='0'+s;

}

return s;

}