Changing a non-vb date to use today/yesterday hack?

[Gutspiller]

I'm using the "Last X Posts v1.0.5" hack and I am trying to get it so that the date it shows uses the today/yesterday hack. I believe this should be a super easy fix, but I am stumped as to what I need to change. The code where the date goes is this:

// the last post date & time column,
	if ($lastpostdate == "1") {
		echo("<td bgcolor=\"$bc\" style=\"font-family:$f; font-size:$fs; color:$tc;\" align=\"center\">$fd</td>\n");
		++$cols;
	}

I can see the variable I need to change is the "$fd", but I don't know the var that I am suppose to change it to to get it to work. Can somebody please help me on this, I can't figure it out for the life of me and would greatly appreciate the help.

Thanks!!!!