Use of undefined constant DATE_RFC2822

I'm trying to send emails with the cakephp mail component.

This is working well but I got this notice in debug mode:

Notice (8): Use of undefined constant DATE_RFC2822 - assumed 'DATE_RFC2822' [CORE/cake/libs/controller/components/email.php, line 599]

It's pretty embarassing since emails have no "send date" when received.

I haven't modified anything in this component or in any file of the cakephp core (except the configuration files obviously开发者_运维问答)

Any idea?

Okay, this constant is used to format dates, cakephp mail component try to use it but it seems to be undefined, probably your version of PHP does not support it.