Countdown timer javascript -

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how make countdown timer same regardless time on pc. script doesn't work wanted to, can change timer changing date , time on pc.

var end = new date('07/31/2015 4:10 pm');  var _second = 1000; var _minute = _second * 60; var _hour = _minute * 60; var _day = _hour * 24; var timer;  function showremaining() {     var = new date();     var distance = end - now;     if (distance < 0) {          clearinterval(timer);         document.getelementbyid('giveaway1').innerhtml = 'the winner has been chosen!';          return;     }     var days = math.floor(distance / _day);     var hours = math.floor((distance % _day) / _hour);     var minutes = math.floor((distance % _hour) / _minute);     var seconds = math.floor((distance % _minute) / _second);      document.getelementbyid('giveaway1').innerhtml = days + 'days ';     document.getelementbyid('giveaway1').innerhtml += hours + 'hrs ';     document.getelementbyid('giveaway1').innerhtml += minutes + 'mins ';     document.getelementbyid('giveaway1').innerhtml += seconds + 'secs'; }  timer = setinterval(showremaining, 1000);

since local pc time outside control, have reliable time server (or third-party server) @ least once.

once know (correct) server time is, can subtract server time local pc time 'offset' (i.e. difference between server time , local pc time).

once have offset can @ time local pc time - via new date() - , factor in offset 'correct' server time, without having call server each time.


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