Invalid date format specification in gemspec

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The ultimate solution is this:

Search “spec” files in your Ruby directory:
*C:\Ruby187\lib\ruby\gems\1.8\specifications*

If a gemspec file contains something like this:
s.date = %q{2011-10-13 00:00:00.000000000Z}
Then delete the 00:00:00.000000000Z part:
s.date = %q{2011-10-13}

After saving those gemspec files, the problem is solved.

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