#35043 [Opn->Bgs]: mktime() seems to return odd results for 31st of October
| From: | derick@php.net | Date: | Tue, 01 Nov 2005 10:14:10 +0000 |
| Subject: | #35043 [Opn->Bgs]: mktime() seems to return odd results for 31st of October | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-87296@lists.php.net to get a copy of this message | ||
ID: 35043
Updated by: derick@php.net
Reported By: daniel at septum dot org
-Status: Open
+Status: Bogus
Bug Type: Date/time related
Operating System: Linux 2.4
PHP Version: 6CVS-2005-11-01 (snap)
New Comment:
We are happy to tell you that you just discovered Daylight Savings
Time. For more information see:
http://webexhibits.org/daylightsaving/b.html
Instead of using mktime/date consider using gmmktime and gmdate which
do
not suffer from DST.
.
Previous Comments:
------------------------------------------------------------------------
[2005-11-01 10:58:41] daniel at septum dot org
Description:
------------
When involving the 31st of October (either by finding out number of
days between 2005-10-29 and 2005-10-31 or 2005-10-31 and 2005-11-01),
it gives the wrong result.
Days between 2005-10-29 and 2005-10-30 returns 1 (which is correct),
however, days between 2005-10-29 and 2005-10-31 returns 3 (which is
incorrect, it should be 2).
It seems to work fine for 2001, 2002, 2003 and 2006-2009, not for 2004
and 2005 (as stated above).
Reproduce code:
---------------
$dos = "2005-10-30";
$year = substr($dos, 0, 4);
$month = substr($dos, 5, 2);
$day = substr($dos, 8, 2);
$mktime_dos = mktime(0, 0, 0, $month, $day, $year);
$next_month = "2005-11-01";
$year = substr($next_month, 0, 4);
$month = substr($next_month, 5, 2);
$day = substr($next_month, 8, 2);
$mktime_now = mktime(0, 0, 0, $month, $day, $year);
$difference = $mktime_now - $mktime_dos;
$signed_up_days_ago = ceil($difference / 60 / 60 / 24);
echo $signed_up_days_ago . "\n";
Expected result:
----------------
2
Actual result:
--------------
3
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=35043&edit=1