How do I add the timestamp of when a widget was last updated onto the widget itself?

To add the timestamp of when a widget was last updated (last query run), add the following to your widget title, description, or footnote:

$c9_DataLastUpdate_${date|yyyy-MM-dd' 'HH:mm:ss z}$

NOTE: If your query is direct, it will show the last query run date/time and not the current date and time. Direct queries are updated in real time upon dashboard refresh.