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Bug #34661 checkdate() function returns false on valid date
Submitted: 2005-09-27 19:15 UTC Modified: 2005-09-27 19:25 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: na at index20 dot ru Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 4.4.0 OS: Linux
Private report: No CVE-ID: None
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 [2005-09-27 19:15 UTC] na at index20 dot ru 
Description:
------------
Checkdate fails if month eq 8 or 9 and passed directly to function. See reproduce code. 5.1 also affected.


Reproduce code:
---------------
echo "buggy:\n";
var_dump(checkdate(07, 01, 2005));
var_dump(checkdate(08, 01, 2005));
var_dump(checkdate(09, 01, 2005));
var_dump(checkdate(10, 01, 2005));

$m07 = '07';
$m08 = '08';
$m09 = '09';
$m10 = '10';

echo "ok:\n";
var_dump(checkdate($m07, 01, 2005));
var_dump(checkdate($m08, 01, 2005));
var_dump(checkdate($m09, 01, 2005));
var_dump(checkdate($m10, 01, 2005));


Expected result:
----------------
buggy:
bool(true)
bool(true)
bool(true)
bool(true)
ok:
bool(true)
bool(true)
bool(true)
bool(true)


Actual result:
--------------
buggy:
bool(true)
bool(false)
bool(false)
bool(true)
ok:
bool(true)
bool(true)
bool(true)
bool(true)

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 [2005-09-27 19:25 UTC] marcot@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

Please read the manual. Numbers prefixed by zero are interpreted as if they were in octal notation by PHP, and they are not valid numbers in that context; therefore, they are converted to decimal zero, which does not indicate a valid month. If you try 

var_dump(checkdate(9, 1, 2005));

You'll see that it works just fine.
 
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