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Editorial Team
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Asked: 2026-05-24T16:34:11+00:00

Earlier today I added the mongoid gem version ‘2.0’ to an app. Ever since

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Earlier today I added the mongoid gem version ‘2.0’ to an app. Ever since then, any time I use the gem command I get the following errors:

Invalid gemspec in [/Library/Ruby/Gems/1.8/specifications/mongoid-2.1.0.gemspec]: invalid date format in specification: "2011-07-31 00:00:00.000000000 %:z"
Invalid gemspec in [/Library/Ruby/Gems/1.8/specifications/mongoid-2.1.7.gemspec]: invalid date format in specification: "2011-08-08 00:00:00.000000000Z"
Invalid gemspec in [/Library/Ruby/Gems/1.8/specifications/mongoid-2.1.0.gemspec]: invalid date format in specification: "2011-07-31 00:00:00.000000000 %:z"
Invalid gemspec in [/Library/Ruby/Gems/1.8/specifications/mongoid-2.1.7.gemspec]: invalid date format in specification: "2011-08-08 00:00:00.000000000Z"

Any idea how to fix this?

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1 Answer

  1. Editorial Team

    This is a known issue with recent versions of Mongoid. There are some fixes on the Mongoid Github page, but in my case they did not work.

    The solution for me was to uninstall the mongoid gem and then reinstall the 2.0.1 version.

    gem uninstall mongoid
gem install mongoid --version "2.0.1"
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