Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID Status Resolution Sev Product Comp Assignee Reporter Summary
25385 NEW --- nor Sisyphus gnome-pa aris vitty Lacks tzdata dependency

File a new bug in the "gnome-panel" component of the "Sisyphus" product