3 files changed, 22 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 4726a68f69..ef6141a51d 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -81,6 +81,18 @@ module ActiveModel
       super
     end
 
+    # Copies the errors from <tt>other</tt>.
+    #
+    # other - The ActiveModel::Errors instance.
+    #
+    # Examples
+    #
+    #   person.errors.copy!(other)
+    def copy!(other) # :nodoc:
+      @messages = other.messages.dup
+      @details  = other.details.dup
+    end
+
     # Clear the error messages.
     #
     #   person.errors.full_messages # => ["name cannot be nil"]
diff --git a/activemodel/lib/active_model/type/time.rb b/activemodel/lib/active_model/type/time.rb
index 7101bad566..fe09f63a87 100644
--- a/activemodel/lib/active_model/type/time.rb
+++ b/activemodel/lib/active_model/type/time.rb
@@ -29,7 +29,11 @@ module ActiveModel
         return value unless value.is_a?(::String)
         return if value.empty?
 
-        dummy_time_value = "2000-01-01 #{value}"
+        if value =~ /^2000-01-01/
+          dummy_time_value = value
+        else
+          dummy_time_value = "2000-01-01 #{value}"
+        end
 
         fast_string_to_time(dummy_time_value) || begin
           time_hash = ::Date._parse(dummy_time_value)
diff --git a/activemodel/lib/active_model/type/value.rb b/activemodel/lib/active_model/type/value.rb
index 5fea0561a6..9d1f267b41 100644
--- a/activemodel/lib/active_model/type/value.rb
+++ b/activemodel/lib/active_model/type/value.rb
@@ -90,6 +90,11 @@ module ActiveModel
           scale == other.scale &&
           limit == other.limit
       end
+      alias eql? ==
+
+      def hash
+        [self.class, precision, scale, limit].hash
+      end
 
       def assert_valid_value(*)
       end