How to change the post data from relative data to absolute

I am currently using a downgraded version of Discourse and rewriting the front-end code using components

Email uses below in a plugin, can i modify short_date from a theme componet?

after_initialize do
  if SiteSetting.custom_email_date_format_enabled
    module ::EmailHelper
      def short_date(datetime)
        china_time = datetime.in_time_zone("Asia/Shanghai")
        china_time.strftime("%Y-%m-%d %H:%M")
      end
    end
  end
end