From: teo8976 at gmail dot com
Operating system: linux
PHP version: 5.6.5
Package: Date/time related
Bug Type: Bug
Bug description:negative relative month values in strtime() give nonsense results
Description:
------------
The way negative relative month values are handled by strtotime() is
1) undocumented
2) complete nonsense
example: strtotime("-3 months", $date)
Test script:
---------------
$end_date=mktime(23,59,59,12,31,2014);
echo date("r", $end_date)."\n";
$date=strtotime("-1 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-2 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-3 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-4 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-5 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-6 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-7 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-8 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-9 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-10 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-11 months", $end_date);
echo date("r", $date)."\n";
$date=strtotime("-12 months", $end_date);
echo date("r", $date)."\n";
Expected result:
----------------
Wed, 31 Dec 2014 23:59:59 +0100
Mon, 30 Nov 2014 23:59:59 +0100
Fri, 31 Oct 2014 23:59:59 +0100
Wed, 30 Sep 2014 23:59:59 +0200
Sun, 31 Aug 2014 23:59:59 +0200
Thu, 31 Jul 2014 23:59:59 +0200
Tue, 30 Jun 2014 23:59:59 +0200
Sat, 31 May 2014 23:59:59 +0200
Thu, 30 Apr 2014 23:59:59 +0200
Mon, 31 Mar 2014 23:59:59 +0200
Mon, 28 Feb 2014 23:59:59 +0100
Fri, 31 Jan 2014 23:59:59 +0100
Tue, 31 Dec 2013 23:59:59 +0100
Actual result:
--------------
Wed, 31 Dec 2014 23:59:59 +0100
Mon, 01 Dec 2014 23:59:59 +0100
Fri, 31 Oct 2014 23:59:59 +0100
Wed, 01 Oct 2014 23:59:59 +0200
Sun, 31 Aug 2014 23:59:59 +0200
Thu, 31 Jul 2014 23:59:59 +0200
Tue, 01 Jul 2014 23:59:59 +0200
Sat, 31 May 2014 23:59:59 +0200
Thu, 01 May 2014 23:59:59 +0200
Mon, 31 Mar 2014 23:59:59 +0200
Mon, 03 Mar 2014 23:59:59 +0100 << THIS IS PARTICULARLY HILARIOUS
Fri, 31 Jan 2014 23:59:59 +0100
Tue, 31 Dec 2013 23:59:59 +0100
--
Edit bug report at https://bugs.php.net/bug.php?id=68981&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68981&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68981&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68981&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=68981&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=68981&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=68981&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=68981&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=68981&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=68981&r=support
Expected behavior: https://bugs.php.net/fix.php?id=68981&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=68981&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=68981&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=68981&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68981&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=68981&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=68981&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=68981&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=68981&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=68981&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=68981&r=mysqlcfg