Edit report at http://bugs.php.net/bug.php?id=53608&edit=1
ID: 53608
Updated by: aharvey@php.net
Reported by: jer_826 at yahoo dot com
Summary: mktime() produces invalid results under 64-bit
-Status: Open
+Status: Verified
Type: Bug
-Package: Unknown/Other Function
+Package: Date/time related
Operating System: Linux 2.6.35.7 x86_64
PHP Version: 5.2.16
Block user comment: N
Private report: N
New Comment:
Confirmed; the error handling in timelib_date_to_int() is insufficient
for platforms with 64 bit longs.
The quick and dirty fix would be to explicitly compare ts in
timelib_date_to_int() to the minimum and maximum values of a 32 bit
integer, but you'd then lose the ability to use mktime() for dates
outside the 1901-2038 range. Better would be to try to detect overflow
in timelib_update_ts(), but that's not going to be foolproof either.
I don't have any particularly strong feelings on this one, or even
whether it's worth trying to handle. Derick?
Previous Comments:
------------------------------------------------------------------------
[2011-01-02 09:52:16] brad at njoe dot com
Confirmed on Ubuntu 10.10 (Linux 2.6.35-24-server x86_64). Also tested a
Win32
build and all three var_dumps() show "bool(false)" as
expected/documented.
------------------------------------------------------------------------
[2010-12-24 22:19:04] jer_826 at yahoo dot com
Description:
------------
It appears that when the PHP binary was compiled against 64-bit
libraries,
mktime() seems to only do minimal error checking of parms. After some
additional
testing, if found the following results:
PHP Code:
$t=mktime(0,0,0,12,3,292277026596);
var_dump($t);
$t=mktime(0,0,0,12,3,292277026597);
var_dump($t);
$t=mktime(900000000000,900000000000,900000000000,900000000000,900000000000,90000
0000000);
var_dump($t);
int(9223372036854655200)
int(-9223372036823360416)
int(-6044405109589065632)
It appears that once the parm value exceeds the value limit of a long
var, the
function returns a negative value. No warnings are produced. Instead of
returning FALSE for an error, the function just returns an invalid
result.
Some additional info here: http://phpbuilder.com/board/showthread.php?
p=10971046#post10971046
Test script:
---------------
$t=mktime(0,0,0,12,3,292277026596);
var_dump($t);
$t=mktime(0,0,0,12,3,292277026597);
var_dump($t);
$t=mktime(900000000000,900000000000,900000000000,900000000000,900000000000,900000000000);
var_dump($t);
int(9223372036854655200)
int(-9223372036823360416)
int(-6044405109589065632)
Expected result:
----------------
Return FALSE if parms are invalid.
Actual result:
--------------
Invalid values. Does not return FALSE.
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/bug.php?id=53608&edit=1