g1smd - 2:15 am on Dec 11, 2008 (gmt 0)

As of today, Google is showing a date as the first couple of words in the snippet for a site: search on one of my sites. This is not a forum or a blog. It is showing the date the page was last modified. I don't know if it is getting it from the "Last Modified" info in the page footer, or from the date in the HTTP Header.

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Marcia. The date is keyed to UTC, so for any time mid-to-late evening in the US, it is already "tomorrow" in terms of UTC. That probably explains your "one day" date discrepancy.