windix/gist:6075388

## gistfile1.phtml
<?php
  $now = time();
?>

<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript">
// we will add our javascript code here

function format_time(d) {
  // 24-hour format of an hour with leading zeros
  var h = new String(d.getHours()).length == 1 ? "0" + d.getHours() : d.getHours();
  // Minutes with leading zeros
  var m = new String(d.getMinutes()).length == 1 ? "0" + d.getMinutes() : d.getMinutes();
  return h + ":" + m;
}

// Offset is in second, GMT+10 will be 36,000
function convert_ts_to_local_date(ts, offset) {
  var GMT_offset = new Date().getTimezoneOffset() * -60;
  return new Date((ts - GMT_offset + offset) * 1000);
}

$(document).ready(function() {
  var ts = <?= $now ?>;

  var d = new Date(ts * 1000);

  var s = "";
  s += d.getTimezoneOffset() + "<br />";
  s += d.getTime() + "<br />";
  s += format_time(d) + "<br />";

  var customer_offset = 9.5 * 3600; // second: GMT+10 -> 36,000

  var d1 = convert_ts_to_local_date(ts, customer_offset);
  s += format_time(d1) + "<br />";

  $("#content").html(s);
});

</script>
</head>
<body>
<pre>
<?php

/* Time stamp is the seconds since 1970-1-1 00:00:00 GMT,
 * so it is not changed along with time zone
 *
 * When time zone change, the local time parsed from time stamp changes
 *
 * On java script side, we cannot control the timezone. Instead,
 * we can manipulate the time stamp to make it looks like that the time zone
 * has been changed, but actually we always stay in the same time zone.
 *
 */

get_ts_info($now);

date_default_timezone_set('Australia/Darwin');
get_ts_info($now);

date_default_timezone_set('GMT');
get_ts_info($now);

function get_ts_info($ts) {
  echo date_default_timezone_get()."\n";
  echo date('Y-m-d H:i:s', $ts)."\n";
  echo $ts."\n";
}

?>
</pre>

 <!-- we will add our HTML content here -->
JS output:<br />
<p id="content"></p>

</body>
</html>
	<?php
	$now = time();
	?>

	<html>
	<head>
	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
	<script type="text/javascript">
	// we will add our javascript code here

	function format_time(d) {
	// 24-hour format of an hour with leading zeros
	var h = new String(d.getHours()).length == 1 ? "0" + d.getHours() : d.getHours();
	// Minutes with leading zeros
	var m = new String(d.getMinutes()).length == 1 ? "0" + d.getMinutes() : d.getMinutes();
	return h + ":" + m;
	}

	// Offset is in second, GMT+10 will be 36,000
	function convert_ts_to_local_date(ts, offset) {
	var GMT_offset = new Date().getTimezoneOffset() * -60;
	return new Date((ts - GMT_offset + offset) * 1000);
	}

	$(document).ready(function() {
	var ts = <?= $now ?>;

	var d = new Date(ts * 1000);

	var s = "";
	s += d.getTimezoneOffset() + "<br />";
	s += d.getTime() + "<br />";
	s += format_time(d) + "<br />";

	var customer_offset = 9.5 * 3600; // second: GMT+10 -> 36,000

	var d1 = convert_ts_to_local_date(ts, customer_offset);
	s += format_time(d1) + "<br />";

	$("#content").html(s);
	});

	</script>
	</head>
	<body>
	<pre>
	<?php

	/* Time stamp is the seconds since 1970-1-1 00:00:00 GMT,
	* so it is not changed along with time zone
	*
	* When time zone change, the local time parsed from time stamp changes
	*
	* On java script side, we cannot control the timezone. Instead,
	* we can manipulate the time stamp to make it looks like that the time zone
	* has been changed, but actually we always stay in the same time zone.
	*
	*/

	get_ts_info($now);

	date_default_timezone_set('Australia/Darwin');
	get_ts_info($now);

	date_default_timezone_set('GMT');
	get_ts_info($now);

	function get_ts_info($ts) {
	echo date_default_timezone_get()."\n";
	echo date('Y-m-d H:i:s', $ts)."\n";
	echo $ts."\n";
	}

	?>
	</pre>

	<!-- we will add our HTML content here -->
	JS output:<br />
	<p id="content"></p>

	</body>
	</html>