After upgrading ExpressionEngine from 2.5.2 to 2.6.1, the Member module now sets the member's localization to PHP format eg. 'Australia/Sydney' in the exp_members table. So, when my site calls EEs Localize class it returns the PHP format instead of the CI format, which is 'UP10', generating this error:
Severity: Notice
Message: Undefined index: Australia/Sydney
Filename: libraries/Localize.php
Line Number: 735
It seems that there is a bug in the javascript generated by the CI Date Helper function timezone_menu(), because the tag should be generated with the latter time zone codes (i.e. Sydney).
The mod.member_settings module generates the localization form for the user using the Localize class in the edit_localization() function.
The Localize class uses the CI Date helper timezone_menu() function to generate a localization menu, but this provides the string 'Sydney/Australia' in the tag, which means this is what is passed back to the update_localization() function in mod.member_settings.php.
See line 1593 in mod.member_settings.php:
$data['timezone'] = $_POST['server_timezone'];
