Convert PHP time to Javascript time in PHP ← (PHP, JavaScript)

How to convert PHP time to Javascript time in PHP? My PHP code:

<?php
$times = array(/* A list of time with "Y-m-d h:i:s" format goes here */);
$return = '[';
$i = 1;
foreach($times as $time) {
  $return .= '['.strtotime($time).','.$i.'],';
  //In my opinion, converting time to
  //js time at here is good choice
  if($i==100) {
    break;
  }
  $i++;
}
$return = substr($return, 0, -1).']';
?>

My script:

<script>
var results = [{
  label: "Buy in",
  data: <?=$return?>
}];
</script>

Solution:

use the output of PHP's date() and Javascript time is in the same format, but multiplied by 1000 because it has millisecond resolution.

Solution:

Final code:

 <?php
      $times = array(/* A list of time with "Y-m-d h:i:s" format goes here */);
      $return = '[';
      $i = 1;
      foreach($times as $time)
      {
          $return .= ('['.strtotime($time)*1000).','.$i.'],';
          if($i==100)
          {
              break;
          }
          $i++;
      }
      $return = substr($return, 0, -1).']';
 ?>

Thank you very much:D! Some time I have stupid thinking like :"How to call js function from php code" for this case. I have to learn more and more...