Home » Date and Time » Date » Bug #2697

[2004-11-05 02:34 UTC] paul at serby dot net

Description:
------------
On a system where the System Clock is set to UTC and the
locale it set to Great Britain during the DST of BST the
Date object returns BST(GMT+1) but says it UTC.

The same happens with all locale's with DST

This bug is fixed if you add all the DSTs to the TimeZone
Data array (_DATE_TIMEZONE_DATA).

ie

'BST' => array(
'offset' => 3600000,
'longname' => "British Summer Time",
'shortname' => 'BST',
'hasdst' => false ),

Reproduce code:
---------------
<pre>
<?php

// Safe Mode must be disabled

// System time as UTC
echo "System UTC:\n" . `/bin/date -u +'%d %b %Y %R:%S %Z'` . "\n";

echo $_DATE_TIMEZONE_DEFAULT;
// System time as default locale (GB)
echo "System Default Locale:\n" . `/bin/date +'%d %b %Y %R:%S %Z'` . "\n";

// PHP - Current time UTC
echo "PHP UTC:\n" . gmdate("d M Y H:i:s T",time()) . "\n\n";

// PHP - Current time default locale
echo "PHP Default Locale\n" . date("d M Y H:i:s T",time()) . "\n\n";

require_once("Date.php");

$date = new Date();
// Date Class - Default TimeZone BST
echo "Date Class BST:\n" . $date->format("%d %b %Y %R:%S %Z") . "\n\n";

// Current TimeZone Should be BST (GMT+1)
echo "Timezone: " . $date->tz->longname . "\n\n";

$date->convertTZbyID("UTC");
echo "Date Class UTC:\n" . $date->format("%d %b %Y %R:%S %Z") . "\n\n";

?>
</pre>

Expected result:
----------------
System UTC:
05 Oct 2004 00:35:17 UTC

System Default Locale:
05 Oct 2004 01:35:17 BST

PHP UTC:
05 Oct 2004 00:35:17 GMT

PHP Default Locale
05 Oct 2004 01:35:17 BST

Date Class BST:
05 Oct 2004 01:35:17 BST

Timezone: British Summer Time

Date Class UTC:
05 Oct 2004 00:35:17 UTC

Actual result:
--------------
System UTC:
05 Oct 2004 00:35:17 UTC

System Default Locale:
05 Oct 2004 01:35:17 BST

PHP UTC:
05 Oct 2004 00:35:17 GMT

PHP Default Locale
05 Oct 2004 01:35:17 BST

Date Class BST:
05 Oct 2004 01:35:17 UTC

Timezone: Coordinated Universal Time

Date Class UTC:
05 Oct 2004 01:35:17 UTC

[2006-01-29 07:58 UTC] play at noiseusse dot org

I was having a similar probem. date objects were returning local times when set to utc. I tracked it down to Date_TimeZone::inDaylightTime().

It was
putenv("TZ=".$env_tz);

I changed to:
if ($env_tz != "") {
putenv("TZ=".$env_tz);
}

Not exactly sure what the larger implications are or if it's system dependent but it seemed to work for me.