I have been using Ai1 sitemap generator and always got the last mod tag, however i UPDATED my version to the latest a week ago and since then I have  getting the site map without the lastmod tag. I reverted to my previous old version and still the same..help please

If I understood you correctly, both the old version + the newest no longer gives lastmod information for your URLs. In that case, something probably changed in the website, so it no longer returns that information.

Check this help page:
http://www.microsystools.com/products/sitemap-generator/help/http-last-modified-meta/

"2-If no relevant HTTP reponse header, the page is checked for last-modified HTML meta tag."

EVERY PAGE ON MY WEBSITE HAS last-modified HTML meta tag

http://www.layyous.com/

what else should I do, shall I contact the server or is the problem with the settings of the program

I just checked using FireFox with Live HTTP headers plugin, and it does not show any last-modified header. I checked your root URL + "English"

I checked with this

http://www.rexswain.com/httpview.html

and it returned

Receiving Header:

HTTP/1.1·200·OK(CR)(LF)
Date:·Sun,·26·May·2013·13:19:52·GMT(CR)(LF)
Content-Type:·text/html(CR)(LF)
Content-Length:·11892(CR)(LF)
Connection:·close(CR)(LF)
Server:·Apache/2(CR)(LF)
Accept-Ranges:·bytes(CR)(LF)
(CR)(LF)


so server is giving out response but sitemap generator is not picking it up

when I referred to tag on page I was referring on having this

<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d/%m/%y" startspan -->22/04/13<!--webbot bot="Timestamp" i-checksum="12722" endspan -->

on every page


please help

Quote from: layyous on May 26, 2013, 09:22:59 AM
I checked with this

http://www.rexswain.com/httpview.html

and it returned

Receiving Header:

HTTP/1.1·200·OK(CR)(LF)
Date:·Sun,·26·May·2013·13:19:52·GMT(CR)(LF)
Content-Type:·text/html(CR)(LF)
Content-Length:·11892(CR)(LF)
Connection:·close(CR)(LF)
Server:·Apache/2(CR)(LF)
Accept-Ranges:·bytes(CR)(LF)
(CR)(LF)

so server is giving out response but sitemap generator is not picking it up

From above we can see the server is not returning any "last-modified" header. It returns "date", but that is not the same. (Please check again what you just wrote, there is no "last-modified")

Quote from: layyous on May 26, 2013, 09:22:59 AM
when I referred to tag on page I was referring on having this

<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d/%m/%y" startspan -->22/04/13<!--webbot bot="Timestamp" i-checksum="12722" endspan -->

on every page

That is not a standard tag to my knowledge, and at least not at present supported by A1SG (any verison), but will be happy to research it and look into implementing support for it.

I contacted the server and they responded by saying that it is the script that is asking for info is at fault not them..now I am at a loss what to do, any suggestions of how to solve the problem

The pages do not respond with "last-modified". And most likely won't no mattter what tool you use to check the headers.

It is not uncommon PHP/ASP/whatever code/scripts on a server tonot respond with "last-modified". That is also why the A1 Sitemap Generator help page for "last modified" lists various code snippets you can use to make sure your website generates and sends those headers.

Otherwise, you will have to wait till A1SG possibly supports the (non-standard) FrontPage generated webbot timestamps inside HTML comments.