Get Date not newer than Now

Hi all,

validating a feed, I realized that {{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }} in the RSS template results in the newest date of any section page, even if the date is in the future.

(There are future dates in several projects I curate because of event calendar entries.)

Is it possible the generate the most recent date—not newer than now?

Thank you!