Is there a standard way for a web server to be able to determine a user’s timezone within a web page?
Perhaps from an HTTP header or part of the user-agent string?
27 s
There are no HTTP headers that will report the clients timezone so far although it has been suggested to include it in the HTTP specification.
If it was me, I would probably try to fetch the timezone using clientside JavaScript and then submit it to the server using Ajax or something.