post_date_gmt in WP_Query

Hello,

I’ve a plug-in which returns posts based on a personalized WP_Query.

I’d like to add a predicate about the field post_date_gmt, but it seems not to work.

What I do is that I generate the value for the predicate as follows:

$now_gmt = gmdate (“Y-m-d H:i:s”, time());

$r=new WP_Query(“post_date_gmt>=’$now_gmt’&…”);

Is this a supported parameter in the WP_Query?

Thanks, Sergio