Bug #64040 [Opn->Nab]: DateTime::createFromFormat() incorrectly parses illogical dates

Edit report at https://bugs.php.net/bug.php?id=64040&edit=1

 ID:                 64040
 Updated by:         [email protected]
 Reported by:        tagadvance at gmail dot com
 Summary:            DateTime::createFromFormat() incorrectly parses
                     illogical dates
-Status:             Open
+Status:             Not a bug
 Type:               Bug
 Package:            Date/time related
 Operating System:   Linux
 PHP Version:        Irrelevant
 Block user comment: N
 Private report:     N

 New Comment:

DateTime tries its best. Returning something rational (Fri 16 Nov 2012 + Wednesday = Wed 21 Nov 2012) with a warning is better than nothing.


Previous Comments:
------------------------------------------------------------------------
[2017-03-29 19:44:05] php-bugs at allenjb dot me dot uk

DateTime does issue a warning through its own internal warning system (DateTime->getLastErrors()) and always has done as far as I can see: https://3v4l.org/uGDe7

------------------------------------------------------------------------
[2014-06-25 13:19:25] nicodoggie at gmail dot com

Taking the same code as OP, another example of parsing illogical dates:

<?php

// November 16 falls on a Friday, NOT a Wednesday
$date = '2014-22-01';
$format = 'Y-m-d';

try {
	$dateTime = DateTime::createFromFormat($format, $date);
	$formattedDateTime = $dateTime->format($format);
	echo $formattedDateTime . PHP_EOL; // prints "2014-10-01"
} catch (Exception $e) {
	// no exception is thrown =(
	echo $e->getMessage();
}

?>

It would be better to throw out a warning, or at least give us a $useStrict = false parameter to play with so we don't break anyone's weird implementation.

Tested on ArchLinux PHP 5.5.13

------------------------------------------------------------------------
[2014-04-25 07:16:25] metamarkers at gmail dot com

"Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?"

There is no amount of code that can be written to error-correct the programmer.

------------------------------------------------------------------------
[2013-01-21 20:21:32] tagadvance at gmail dot com

Description:
------------
---
From manual page: http://www.php.net/datetime.createfromformat
---
The DateTime::createFromFormat() method incorrectly parses an illogical date. I 
have tested this on version 5.3.3 (CentOS) and 5.4.6 (Ubuntu).

Test script:
---------------
<?php

// November 16 falls on a Friday, NOT a Wednesday
$date = 'Wednesday 16 November 2012';
$format = 'l d M Y';

try {
	$dateTime = DateTime::createFromFormat($format, $date);
	$formattedDateTime = $dateTime->format($format);
	echo $formattedDateTime . PHP_EOL; // prints "Wednesday 21 Nov 2012"
} catch (Exception $e) {
	// no exception is thrown =(
	echo $e->getMessage();
}

?>

Expected result:
----------------
I expect the createFromFormat method to throw an error if the date is illogical. 
At the very least a warning should be added to the log.

Actual result:
--------------
The createFromFormat parses the illogical date. The day seems to take precedence 
over the date. I am just guessing here, but it then seems to round up by one week 
so that the date makes sense.


------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=64040&edit=1