GMT and UTC are the same my friend in case you didn't know. The "Last modification" configuration setting under the Attributes tab is meaningless if a user chooses, "use server's response". In fact the little help notation beneath those options reads, "You can let the generator set this field from your server's response headers..." is false, or misleading. And, your help to me in this thread has been completely misleading. I have been asking you all along how to get the generator to use the actual "lastmod" date and time from my hosting server, and you have been leading me along all this time to believe that this was possible as long as the server's headers are being supplied correctly. Simply not true. Please tell the authors of this generator they need to fix this because I have now spent many hours trying to make this work only to find out it doesn't work. Furthermore, when someone like me asks a question for help like my first post in this thread, your response should categorically be, "Well, even if you choose the "use server's response" setting, AND your hosting servers provide a "Last-modification" response in their header for each page, the XML Sitemap Generator will not provide the correct "lastmod" date and time in the results, unless you live in the GMT time zone. We have been asked to provide a time zone option in our tool for several years, but we have seen no need to do that." Your responses to me in this thread however have been a waste of my time and your time sir.