Have you done a forum search for time zone ip?
This would be the result
https://community.particle.io/search?q=time%20zone%20ip
And a Google search may also provide some background on the topic
https://www.google.at/search?q=google+timezone+api&oq=google+timezone+api+&aqs=chrome..69i57j0l5.21746j0j7&sourceid=chrome&ie=UTF-8
(I closed your double post about this very topic - don’t double post!)