The Add Date Updated Field in the Write Settings is initially specified when new ScrapeMaps are created in the ScrapeMap Explorer Pane. To edit the Add Date Updated Field for pre-existing ScrapeMaps, open the ScrapeMap and go to General Properties.
Select the Add Date Updated Field in the Write Settings Dialog Box. This will write a column with the date of the ScrapeMap web scraping run.
The output files will include a column indicating when the data was scraped.