XML sitemap generator / CSV to XML sitemap converter help

Settings Remark
Last modification
The date of last modification of the file.
This date should be in W3C Datetime format.
This format allows you to omit the time portion, if desired, and use YYYY-MM-DD.

Note that this tag is separate from the If-Modified-Since (304) header the server can return, and search engines may use the information from both sources differently.