#43188 [Asn->Bgs]: Daylight Savings Time Related Problem with Date()
| From: | derick@php.net | Date: | Sat, 08 Dec 2007 15:52:28 +0000 |
| Subject: | #43188 [Asn->Bgs]: Daylight Savings Time Related Problem with Date() | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-120478@lists.php.net to get a copy of this message | ||
ID: 43188
Updated by: derick@php.net
Reported By: ebrueggeman at gmail dot com
-Status: Assigned
+Status: Bogus
Bug Type: Date/time related
Operating System: Windows
PHP Version: 5.2.4
Assigned To: derick
New Comment:
This is correct behavior.
In the first example you add 5 times 24 hours, but in the 2nd one, you
add 5 days. There is a subtle difference here because Sunday November
4th, 2007 actually has *25* hours.
You can see this in action if you add "H:i:s T" to your formatting
strings:
<?php
date_default_timezone_set ("America/New_York");
$receiptStamp=mktime(0, 0, 0, 10, 31, 2007);
$modStamp= $receiptStamp + (5 * 24 * 60 * 60); /* Addition of 5 days
of time */
echo date('m/d/Y H:i:s T', $modStamp) . "\n";
/* prints 11/04/2007 */
$dateObject=new DateTime("10/31/2007");
$dateObject->modify("+5 day");
echo date_format( $dateObject, 'm/d/Y H:i:s T' ). "\n";
/* prints 11/05/2007 */
/*After the old daylight savings crossover week*/
$dateObject=new DateTime("11/7/2007");
$dateObject->modify("+5 day");
echo date_format( $dateObject, 'm/d/Y H:i:s T' ). "\n";
/* prints 11/12/2007 */
$receiptStamp=mktime(0, 0, 0, 11, 7, 2007);
$modStamp= $receiptStamp + (5 * 24 * 60 * 60); /* Addition of 5 days
of time */
echo date('m/d/Y H:i:s T', $modStamp). "\n";
?>
outputs:
11/05/2007 23:00:00 EST
11/05/2007 00:00:00 EST
11/12/2007 00:00:00 EST
11/12/2007 00:00:00 EST
Previous Comments:
------------------------------------------------------------------------
[2007-11-04 21:51:47] ebrueggeman at gmail dot com
Description:
------------
The date() function is not accurately displaying output expected of
dates during the 1 week long time before daylight savings time, likely
because of the change in the start of daylight savings time from the
year prior.
Reproduce code:
---------------
date_default_timezone_set ("America/New_York");
$receiptStamp=mktime(0, 0, 0, 10, 31, 2007);
$modStamp= $receiptStamp + (5 * 24 * 60 * 60); /* Addition of 5 days
of time */
echo date('m/d/Y', $modStamp) . '<br>';
/*
prints 11/04/2007
*/
$dateObject=new DateTime("10/31/2007");
$dateObject->modify("+5 day");
echo date_format( $dateObject, 'm/d/Y' ). '<br>';
/*
prints 11/05/2007
*/
/*After the old daylight savings crossover week*/
$dateObject=new DateTime("11/7/2007");
$dateObject->modify("+5 day");
echo date_format( $dateObject, 'm/d/Y' ). '<br>';
/*
prints 11/12/2007
*/
$receiptStamp=mktime(0, 0, 0, 11, 7, 2007);
$modStamp= $receiptStamp + (5 * 24 * 60 * 60); /* Addition of 5 days
of time */
echo date('m/d/Y', $modStamp). '<br>';
Expected result:
----------------
11/05/2007
11/05/2007
11/12/2007
11/12/2007
Actual result:
--------------
11/04/2007
11/05/2007
11/12/2007
11/12/2007
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=43188&edit=1