Datetime-> modify（'second thursday'）无法正常工作

Question

I am trying to get the second thursday from a datetime.

Code

 $test = new DateTime('2013-08-02 10:00');
 echo $test->modify('second thursday'.$test->format('H:i'))->format('Y-m-d H:i');

The above code returns 2013-08-15 10:00 instead of 2013-08-08 10:00

But it works correctly when I use the following code

 $test = new DateTime('2013-08-02 10:00');
 echo $test->modify('second wednesday'.$test->format('H:i'))->format('Y-m-d H:i');

Answer 1

First day of month of 2013-August is Thursday.

And there is bug in the code that if if the first day is Thursday , first Thursday will come in the next week i.e 8-August and like wise 2nd second Thursday will come on 15-August

this code will help

echo date('Y-m-d', strtotime('second thursday of august 2013'));

updated code

 $test = new DateTime('2013-08-02 10:00');
echo date('Y-m-d', strtotime("second thursday of august 2013")).' '.$test->format('H:i');

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Added By RC

From PHP strtotime manual page

In PHP 5 prior to 5.2.7, requesting a given occurrence of a given weekday in a month where that weekday was the first day of the month would incorrectly add one week to the returned timestamp. This has been corrected in 5.2.7 and later versions.