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Bug #62784 DateTime: "last day of" with timestamps is buggy
Submitted: 2012-08-09 07:58 UTC Modified: 2022-05-13 13:41 UTC
Votes:5
Avg. Score:3.4 ± 0.8
Reproduced:4 of 4 (100.0%)
Same Version:1 (25.0%)
Same OS:1 (25.0%)
From: daniel dot rudolf at eifel-online dot com Assigned: derick (profile)
Status: Closed Package: Date/time related
PHP Version: 5.3.15 OS: Windows XP
Private report: No CVE-ID: None
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 [2012-08-09 07:58 UTC] daniel dot rudolf at eifel-online dot com
Description:
------------
Using new DateTime("last day of @timestamp") doesn't work properly

Test script:
---------------
<?php
$time = new DateTime('2012-01-01 00:00:00 UTC');
$time = $time->getTimestamp();
$monthEnd = new DateTime('last day of @'.$time);
echo date('Y-m-d', $time)." --> ".$monthEnd->format('Y-m-d')."\n";

/* ----------------------------------- */

$time = new DateTime('now'); // today = 2012-08-09
$time = $time->getTimestamp();
$monthEnd = new DateTime('last day of @'.$time);
echo date('Y-m-d', $time)." --> ".$monthEnd->format('Y-m-d')."\n";

/* ----------------------------------- */

$time = new DateTime('2020-12-12');
$time = $time->getTimestamp();
$monthEnd = new DateTime('last day of @'.$time);
echo date('Y-m-d', $time)." --> ".$monthEnd->format('Y-m-d')."\n";

/* ----------------------------------- */

$time = new DateTime('2000-02-01'); // leapyear
$time = $time->getTimestamp();
$monthEnd = new DateTime('last day of @'.$time);
echo date('Y-m-d', $time)." --> ".$monthEnd->format('Y-m-d')."\n";

/* ----------------------------------- */

$time = new DateTime('2000-02-01 00:00:01 UTC');
$time = $time->getTimestamp();
$monthEnd = new DateTime('last day of @'.$time);
echo date('Y-m-d', $time)." --> ".$monthEnd->format('Y-m-d')."\n";
?>

Expected result:
----------------
2012-01-01 --> 2012-01-31
2012-08-09 --> 2012-08-31
2020-12-12 --> 2020-12-31
2000-02-01 --> 2000-02-29
2000-02-01 --> 2000-02-29


Actual result:
--------------
2012-01-01 --> 2012-01-31
2012-08-09 --> 2012-09-08
2020-12-12 --> 2021-01-10
2000-02-01 --> 2000-03-01
2000-02-01 --> 2000-03-02


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 [2012-08-09 08:04 UTC] daniel dot rudolf at eifel-online dot com
Note that only timestamps are affected!

<?php
$time = new DateTime('2000-02-01 00:00:01 UTC');
$time = $time->getTimestamp();
$monthEnd = new DateTime('last day of '.date('r', $time));
echo date('Y-m-d', $time)." --> ".$monthEnd->format('Y-m-d')."\n";
// Expected and actual result: 2000-02-01 --> 2000-02-29 
?>
 [2022-05-13 13:41 UTC] derick@php.net
The phrase "last day of @7289347234" really does not have any meaning, so I am not sure whether it makes sense to do anything here. I am closing this, as this would increase the parser complexity significantly, with a reasonable workaround available. If you have a really compelling case, feel free to add a ticket to https://github.com/php/php-src/issues, but it needs to have a really good reason for this to get added.
 [2022-05-13 13:41 UTC] derick@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: derick
 
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Last updated: Tue Aug 09 20:05:45 2022 UTC