For Date::Manip 7.0

   Date::Manip::internal::Cache   : class for caching data
   Date::Manip::internal::Config  : class for config data
   Date::Manip::internal::TZdata  : all of the TZdata
   Date::Manip::internal::Lang    : language data

   Date::Manip::SimpleDate        : y/m/d operations only
                                       is_business_date
   Date::Manip::SimpleTime        : h/mn/s (time of day) operations only
                                       is_business_time
   Date::Manip::TZ                : local timezone info

   Date::Manip::Base              : deprecated

   Date::Manip::Date
      Date::Manip::internal::Cache
      Date::Manip::internal::Config
      Date::Manip::SimpleDate        : in local timezone
      Date::Manip::SimpleTime        : in local timezone
      Date::Manip::SimpleDate        : in GMT
      Date::Manip::SimpleTime        : in GMT

???

   Date::Manip::GMTDate              : ignore all timezone issues