Multi timezone support D-day javascript library
Usage and example Sourcecode on index.html
new EZdday().checkLocalUTC(); // check your timezone
EZdday().set(Date Object, timezone); // set target time
EZdday().getDate||getHours||getMinute||getSeconds() //get remain time
var mydday = new EZdday();
mydday.set(new Date('Fri Jul 31 2020 01:41:02'), 9); //your target date, your timezone<br>
var mydday = new EZdday();
mydday.set(new Date(vdateStr), 9);
var time = document.getElementById('time');
setInterval(function(){
time.innerHTML = mydday.getDate()+':'+mydday.getHours()+':'+mydday.getMinute()+':'+mydday.getSeconds();
},100);