#7646 and more:

- Users who have not edited their account yet would be reset to GMT rather than the sitewide timezone.
- Users who chose GMT (zero timezone) on a site with a non-zero timezone as default would have incorrect timezone.

1 files changed, 6 insertions, 1 deletions

diff --git a/includes/common.inc b/includes/common.inc
index 2f5df9e48..feab010d2 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -915,7 +915,12 @@ function format_interval($timestamp, $granularity = 2) {
 function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL) {
   if ($timezone === NULL) {
     global $user;
-    $timezone = $user->uid ? $user->timezone : variable_get('date_default_timezone', 0);
+    if (variable_get('configurable_timezones', 1) && $user->uid && strlen($user->timezone)) {
+      $timezone = $user->timezone;
+    }
+    else {
+      $timezone = variable_get('date_default_timezone', 0);
+    }
   }
 
   $timestamp += $timezone;