"Translate" date returned in Portuguese to English

Question

Good night people!

I have a problem with a php script attached to phpbb cms, which returns the topics of certain forums and presents them in RSS 2.0 format.

The problem is that the date, while being processed by phpbb’s own method format_date, in the format "D, d M Y H:i:s O", is returned with the values of day and month in Portuguese, and I need these values in English, because the services I use end up bugging with the date in Portuguese.

I had seen in other questions here in the stack about the possibility of changing the locale to do such processing, but I have doubts about the effectiveness of this under the phpbb ecosystem.

An important detail is that the original data to be filtered by this method (variable $topic_date) is a UNIX timestamp, which means it can be used in another function, and that, according to the method documentation, I can use any format accepted by php’s date() function in the function format_date.

EDIT: In short:

The PHPBB can return me a timestamp or in the proper format of the RSS, but with the names in Portuguese:

<pubDate>Qui, 02 Out 2002 15:00:00 +0200</pubDate>

But I need it in English (because it duplicated services like twitterfeed), exactly in this format:

<pubDate>Wed, 02 Oct 2002 15:00:00 +0200</pubDate>

So there is a way to do this?

Grateful from now on.