Countdown Javascript + PHP

<?php


$future_date = '02/19/2025 10:1 AM';
?>
<script>
var end = new Date('<?php echo $future_date;?>');

var _second = 1000;
    var _minute = _second * 60;
    var _hour = _minute * 60;
    var _day = _hour * 24;
    var timer;

function showRemaining() {
        var now = new Date();
        var distance = end - now;
        if (distance < 0) {

clearInterval(timer);
            document.getElementById('countdown').innerHTML = 'EXPIRED!';

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('countdown').innerHTML = days + ' days ';
        document.getElementById('countdown').innerHTML += hours + ' hrs ';
        document.getElementById('countdown').innerHTML += minutes + ' mins ';
        document.getElementById('countdown').innerHTML += seconds + ' secs';
    }

timer = setInterval(showRemaining, 1000);
</script>
<div id="countdown"></div>

Validasi jarak tanggal

<?php

$string = '2014-12-30 11:00 PM - 2015-01-29 11:59 AM';

  public function _check_date_range($string){

    if(strpos($string," - ")){

        $d = explode(" - ", $string);

        $d1 = date_format(date_create_from_format('Y-m-d h:i A', $d[0]),'Y-m-d H:i:s');

        $d2 = date_format(date_create_from_format('Y-m-d h:i A', $d[1]),'Y-m-d H:i:s');

        if($d1 && $d2){

          return true;

        }else{

          $this->form_validation->set_message('_check_date_range', $d1);

          return false;

        }

    }else{

      $this->form_validation->set_message('_check_date_range', 'The %s field does not contain - ');

      return false;

    }

  }

?>

set_message($input_name,$message);

<?php

 public function username_check($str){

if ($str == 'test'){

  $this->form_validation->set_message('username_check', 'The %s field can not be the word "test"');

  return FALSE;

}else{

   return TRUE;

}

}

?>

checkdate() ( Pemeriksaan tanggal )

<?php
$year = 2000;
$date = 31;
$month = 12;
if(checkdate($month, $date, $year)){
 echo "TRUE";
}
?>