Perform Date => Time coercion on yaml loading. Fixes rubygems#266

lib/rubygems/specification.rb

@@ -2458,6 +2458,9 @@ def yaml_initialize(tag, vals) # :nodoc:
       instance_variable_set "@#{ivar}", val.untaint
     end
 
+    # Force Date to go through the extra coerce logic in date=
+    self.date = @date
+
     @original_platform = @platform # for backwards compatibility
     self.platform = Gem::Platform.new @platform
   end

test/rubygems/test_gem_specification.rb

@@ -234,6 +234,57 @@ def test_self_from_yaml_cleans_up_defaultkey_from_newer_192
     refute_match %r%DefaultKey%, new_spec.to_ruby
   end
 
+  def test_self_from_yaml_cleans_up_Date_objects
+    yaml = <<-YAML
+--- !ruby/object:Gem::Specification
+rubygems_version: 0.8.1
+specification_version: 1
+name: diff-lcs
+version: !ruby/object:Gem::Version
+  version: 1.1.2
+date: 2004-10-20
+summary: Provides a list of changes that represent the difference between two sequenced collections.
+require_paths:
+  - lib
+author: Austin Ziegler
+email: diff-lcs@halostatue.ca
+homepage: http://rubyforge.org/projects/ruwiki/
+rubyforge_project: ruwiki
+description: "Test"
+bindir: bin
+has_rdoc: true
+required_ruby_version: !ruby/object:Gem::Version::Requirement
+  requirements:
+    -
+      - ">="
+      - !ruby/object:Gem::Version
+        version: 1.8.1
+  version:
+platform: ruby
+files:
+  - tests/00test.rb
+rdoc_options:
+  - "--title"
+  - "Diff::LCS -- A Diff Algorithm"
+  - "--main"
+  - README
+  - "--line-numbers"
+extra_rdoc_files:
+  - README
+  - ChangeLog
+  - Install
+executables:
+  - ldiff
+  - htmldiff
+extensions: []
+requirements: []
+dependencies: []
+    YAML
+
+    new_spec = Gem::Specification.from_yaml yaml
+
+    assert_kind_of Time, new_spec.date
+  end
 
   def test_self_load
     full_path = @a2.spec_file