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Bug #71725 Incorrect ordinal suffix used for 29th February
Submitted: 2016-03-06 22:27 UTC Modified: 2016-03-07 01:11 UTC
From: daniel at honestempire dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 7.0.4 OS: Mac OS X
Private report: No CVE-ID: None
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 [2016-03-06 22:27 UTC] daniel at honestempire dot com 
Description:
------------
When attempting to find the last weekday of February 2016, I stumbled across this bug. See the test script for replication information.

Test script:
---------------
$lastDayOfMonth = date('tS F Y', strtotime('2016-02-01 12:00:00'));
var_dump($lastDayOfMonth); // string(18) "29st February 2016"
var_dump(date('d', strtotime(sprintf('last weekday %s', $lastDayOfMonth)))); // string(2) "26" (should be string(2) "29")

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 [2016-03-06 22:46 UTC] daniel at honestempire dot com
-Status: Open +Status: Closed
 [2016-03-06 22:46 UTC] daniel at honestempire dot com 
It would appear the ordinal is parsed before the t flag, removing the ordinal fixes my issue.
 [2016-03-07 01:11 UTC] requinix@php.net
-Status: Closed +Status: Not a bug -Package: Calendar related +Package: Date/time related
 [2016-03-07 01:11 UTC] requinix@php.net 
'S' works according to the date you passed, which was Feb 1. 't' is merely the number of days in the month and will not magically turn the date into Feb 29.

// 03-00 will underflow to whichever is the last day of February
$lastDayOfMonth = date('jS F Y', strtotime('2016-03-00 12:00:00'));
 
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