1 files changed, 47 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/type/date_time.rb b/activerecord/lib/active_record/type/date_time.rb
new file mode 100644
index 0000000000..0a737815bc
--- /dev/null
+++ b/activerecord/lib/active_record/type/date_time.rb
@@ -0,0 +1,47 @@
+module ActiveRecord
+  module Type
+    class DateTime < Value # :nodoc:
+      include TimeValue
+
+      def type
+        :datetime
+      end
+
+      def type_cast_for_database(value)
+        zone_conversion_method = ActiveRecord::Base.default_timezone == :utc ? :getutc : :getlocal
+
+        if value.acts_like?(:time)
+          if value.respond_to?(zone_conversion_method)
+            value.send(zone_conversion_method)
+          else
+            value
+          end
+        else
+          super
+        end
+      end
+
+      private
+
+      def cast_value(string)
+        return string unless string.is_a?(::String)
+        return if string.empty?
+
+        fast_string_to_time(string) || fallback_string_to_time(string)
+      end
+
+      # '0.123456' -> 123456
+      # '1.123456' -> 123456
+      def microseconds(time)
+        time[:sec_fraction] ? (time[:sec_fraction] * 1_000_000).to_i : 0
+      end
+
+      def fallback_string_to_time(string)
+        time_hash = ::Date._parse(string)
+        time_hash[:sec_fraction] = microseconds(time_hash)
+
+        new_time(*time_hash.values_at(:year, :mon, :mday, :hour, :min, :sec, :sec_fraction, :offset))
+      end
+    end
+  end
+end