You can optionally include a file modified date in your sitemap.
For files held on your computer G-Mapper will use which ever date is greatest out of the file create and file modified date.
When indexing a live website G-Mapper will use the modified date returned be the server. Usually your server will derive this from the file date, however in some cases it may simply return todays date.
Speak to your hosting provider if you are having problems with dates returned by your server.
from Xml Sitemap Generator.org
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