Solve gem Invalid gemspec invalid date format in specification on Ubuntu Oneiric 11.10

After upgrade into Ubuntu Oneirice 11.10, i got this error when doing "gem".

Invalid gemspec in [/var/lib/gems/1.8/specifications/json-1.5.4.gemspec]: invalid date format in specification: "2011-08-31 00:00:00.000000000Z"


Solution is edit broken "gemspec" files ( [/var/lib/gems/1.8/specifications/json-1.5.4.gemspec ).
Change "s.date" into :

s.date = %q{2011-08-31}


Done! :)

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