http://forum.geonames.org/gforum/posts/list/4.page JForum - http://www.jforum.net http://forum.geonames.org/gforum/posts/list/2713.page#9753 http://forum.geonames.org/gforum/posts/list/2713.page#9753 GMT timezoneId is the relevant piece of information, it refers to the olson timezone database that is included in most programming environments and includes the dst rules. Best Marc]]> http://forum.geonames.org/gforum/posts/list/2713.page#9758 http://forum.geonames.org/gforum/posts/list/2713.page#9758 GMT