Regardless of upgrade, still getting same error with DT Upcoming Events Module.
Fatal error: Call to undefined function timezone_abbreviations_list() in /vservers/gxpconferences/htdocs/administrator/components/com_dtregister/lib/defines.php on line 45
for:
http://www.GxPConferences.com
(module currently disabled - when enabled, shuts down the entire site with above error)
I just fixed this on your site. Removed one line in the module php file that is no longer needed. It was causing an issue on your site due to the older php version.
We'll be including the updated module in the next DT Reg package update.