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Home/ Questions/Q 6642735
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T23:57:57+00:00 2026-05-25T23:57:57+00:00

I just installed the heroku ruby gem on Windows 7 and received the following

  • 0

I just installed the heroku ruby gem on Windows 7 and received the following error when trying to create a new instance. Have been researching the cause for the past two days with no luck.

C:\Users\admin\RubymineProjects\first_app>heroku create
Invalid gemspec in [C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/specifications
/heroku-2.8.5.gemspec]: invalid date format in specification: "2011-10-05 00:00:
00.000000000Z"
C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:926:in `report_ac
tivate_error': Could not find RubyGem heroku (>= 0) (Gem::LoadError)
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:244:
in `activate_dep'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:236:
in `activate'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:1307
:in `gem'
        from C:/RailsInstaller/Ruby1.8.7/bin/heroku:18

C:\Users\admin\RubymineProjects\first_app>
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  1. Editorial Team
    Editorial Team
    2026-05-25T23:57:58+00:00Added an answer on May 25, 2026 at 11:57 pm

    Try one of the following solutions (if you haven’t already) – this isn’t specific to Windows:

    Invalid date format specification in gemspec

    invalid date format in specification

    Invalid gemspec because of the date format in specification

    How to safely fix "invalid date format in specification" for webrobots-0.0.10.gemspec

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