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Bug #71690 DateTime::createFromFormat malfunctions on a leap day
Submitted: 2016-02-29 14:01 UTC Modified: 2016-02-29 17:31 UTC
Votes:1
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: stefan at forward dot cat Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 7.0.3 OS:
Private report: No CVE-ID: None
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 [2016-02-29 14:01 UTC] stefan at forward dot cat 
Description:
------------
See test script, DateTime::createFromFormat("Y-m", "2015-02") creates a date in march  (March 1 2015) when run today 29/2/2016.

possibly related: https://bugs.php.net/bug.php?id=70956&edit=2

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

$timezone = new DateTimeZone("UTC");
$result = DateTime::createFromFormat("Y-m", "2015-02", $timezone);
$timestamp = $result->format('U');
$date_time = date_create('@' . $timestamp);
date_timezone_set($date_time, $timezone);
echo date_format($date_time, 'Y-m-d H:i:s');

Expected result:
----------------
2015-03-01 12:21:30

Actual result:
--------------
not a date in march

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 [2016-02-29 17:05 UTC] stefan at forward dot cat 
This should say:


Expected result:
----------------
A date in february

Actual result:
--------------
2015-03-01 12:21:30
 [2016-02-29 17:13 UTC] supraguy at yandex dot com 
I am having a similar issue as well.

In my code if you do the following today (2016-02-29)

var_dump(date('Y-m', strtotime('now -11 months'))); 
var_dump(date('Y-m', strtotime('now -12 months'))); 

The both return the same result, string(7) "2015-03" 

PHP 5.4.45
 [2016-02-29 17:31 UTC] derick@php.net
-Status: Open +Status: Not a bug
 [2016-02-29 17:31 UTC] derick@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

This is the right behaviour. Any not-parsed date item (year, month, day, hour, min, second) is initialised with the current values. If you want to reset them to 1970-1-1 0:0:0, then you need to add the ! specifier:

Compare:
php -r 'var_dump(date_create_from_format("Y-m", "2015-02"));'
to
php -r 'var_dump(date_create_from_format("!Y-m", "2015-02"));'

This is documented at http://php.net/manual/en/datetime.createfromformat.php
 
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