    # File lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 112
          def self.string_to_time(string)
            return string unless string.is_a?(String)
            time_hash = Date._parse(string)
            time_hash[:sec_fraction] = microseconds(time_hash)
            time_array = time_hash.values_at(:year, :mon, :mday, :hour, :min, :sec, :sec_fraction)
            # treat 0000-00-00 00:00:00 as nil
            Time.send(Base.default_timezone, *time_array) rescue DateTime.new(*time_array[0..5]) rescue nil
          end