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Bug #67863 datetime->sub does not work well
Submitted: 2014-08-19 12:09 UTC Modified: 2014-08-19 17:07 UTC
From: teamo dot um1 at mail dot ru Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.4.31 OS: linux
Private report: No CVE-ID: None
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 [2014-08-19 12:09 UTC] teamo dot um1 at mail dot ru 
Description:
------------
subsription of months does not work well for the last day of month


Test script:
---------------
$date = new \DateTime();
$date->setDate(2014, 7, 31);
$date->setTime(0,0,0);
print($date->format('Y-m-d'))."\n";
$date->sub(new \DateInterval('P1M'));
print($date->format('Y-m-d'))."\n";
->> 2014-07-31
->> 2014-07-01
must be 2014-06-30

$date->setDate(2014, 8, 31);
->> 2014-08-31 
->> 2014-07-31
ok

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 [2014-08-19 17:07 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2014-08-19 17:07 UTC] requinix@php.net 
P1M means literally one month. 7/31 minus one month is 6/31, which "wraps" around to 7/1.
 
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