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Doc Bug #62476 DateTime::createFromFormat z format incorrect wrt 29.02
Submitted: 2012-07-04 00:20 UTC Modified: 2021-10-01 13:01 UTC
Votes:27
Avg. Score:4.6 ± 0.7
Reproduced:24 of 25 (96.0%)
Same Version:5 (20.8%)
Same OS:4 (16.7%)
From: kaido at tradenet dot ee Assigned:
Status: Closed Package: Date/time related
PHP Version: 5.4.4 OS: debian 2.6.32-5-amd64
Private report: No CVE-ID: None
View Add Comment Developer Edit
 [2012-07-04 00:20 UTC] kaido at tradenet dot ee 
Description:
------------
When creating DateTime object from string and using z (day of year) format option, 
the 29.02 of the leap year is missing. works ok in 5.3.5

Test script:
---------------
for ($d=55;$d<65;$d++) {
        $dt = DateTime::createFromFormat ('z.Y', $d.'.2012');
        $dd = $dt->format ('d.m.Y');
        echo "$d $dd\n";
}

29.02.2012 is clearly missing .. 

Expected result:
----------------
55 25.02.2012
56 26.02.2012
57 27.02.2012
58 28.02.2012
59 29.02.2012
60 01.03.2012
61 02.03.2012
62 03.03.2012
63 04.03.2012
64 05.03.2012

Actual result:
--------------
55 25.02.2012
56 26.02.2012
57 27.02.2012
58 28.02.2012
59 01.03.2012
60 02.03.2012
61 03.03.2012
62 04.03.2012
63 05.03.2012
64 06.03.2012

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 [2012-07-05 11:04 UTC] Sjon at hortensius dot net 
I can confirm this, this is broken since 5.3.9

http://3v4l.org/1Z4W4
 [2012-07-05 19:13 UTC] kaido at tradenet dot ee 
the bug was introduced in commit 4c9fad8b362a7d2b6a94b4961e4b2dc037b2766d to fix 
the bug #51994.

the problem is that in parse_date.c in timelib_parse_from_format() function, in 
case of the z-format option, the date is immidiately normalized, but at that 
point (if year format option happens to come _after_ the z - ie right from it) 
year is not yet set, and -99999 is used instead, which most probably is not a 
leap year :)

the obvious quick solution is to call timelib_do_normalize() only if year is  
set already.

doing so passes all test, too. even the one for #51994.

should the timelib_do_normalize() call be added to year option, too, if 
date/month are set at that point?


also, in timelib_do_normalize() there seems to be 3 checks like:

if (time->s != TIMELIB_UNSET) .. 

shouldn't 2nd and 3rd be "if (time->i != TIMELIB_UNSET)" and "if (time->h != 
TIMELIB_UNSET)" instead ?

(I did not dig deep enough, to be sure, though)
 [2015-02-03 19:40 UTC] kohenkatz at gmail dot com 
Why is this still an issue 2.5 years later?

I see it in 5.5.12 on Ubuntu 14.10 and 5.6.5 on Windows Server 2012.
 [2015-03-10 09:14 UTC] info at giorgiosironi dot com 
Possible workaround:

$ php -r 'echo DateTime::createFromFormat("z Y", "59 2016")->format("Y-m-d"), PHP_EOL;'
2016-03-01
$ php -r 'echo DateTime::createFromFormat("Y z", "2016 59")->format("Y-m-d"), PHP_EOL;'
2016-02-29
$ php -v
PHP 5.4.31-1+deb.sury.org~precise+1 (cli) (built: Jul 25 2014 07:04:32)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.2, Copyright (c) 1999-2013, by Zend Technologies

If it can be any helpful in Google searches for this bug, we encountered this when using MongoDB $dayOfYear aggregation option.
 [2016-06-14 12:18 UTC] cmb@php.net 
Related To: Bug #70956
 [2016-07-28 17:27 UTC] cmb@php.net
-Package: Calendar related +Package: Date/time related
 [2021-10-01 12:38 UTC] cmb@php.net
-Type: Bug +Type: Documentation Problem
 [2021-10-01 12:38 UTC] cmb@php.net 
As of PHP 8.0.10, it is no longer possible to use "z.Y" at all ("A
'day of year' can only come after a year has been found").  Fixing
the unsupported format to "Y.z" brings the desired results[1].

So this is a documentation problem.

[1] <https://3v4l.org/2In8R>
 [2021-10-01 13:01 UTC] cmb@php.net 
Ah, just found that the change in PHP 8.0.10 is due to fixing bug
#79580.  Apparently, when the day-of-year is parsed before the
given year, the day-of-year is applied to the current year.
 [2021-10-01 13:34 UTC] git@php.net 
Automatic comment on behalf of cmb69
Revision: https://github.com/php/doc-en/commit/a8f160fa977075f981c74bff2a68abb99c98f04d
Log: Fix #62476: DateTime::createFromFormat z format incorrect wrt 29.02
 [2021-10-01 13:34 UTC] git@php.net
-Status: Open +Status: Closed
 
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