title: Get the date/time that Sitecore last published
body: <p>Simple question, I think:  is there a value, either in the API or the Web database, that will tell me the last time content was published using sitecore?  It looks like there's an "Updated" column in the "Items" table that might do this, but I'd like to be sure.  I don't need to know individual items, just the last time any content was published.</p>