template<typename CharT> 
struct time_formats {
  // types
  typedef CharT char_type;

  static const char_type fractional_seconds_format;
  static const char_type fractional_seconds_or_none_format;
  static const char_type seconds_with_fractional_seconds_format;
  static const char_type seconds_format;
  static const char_type standard_format;
  static const char_type zone_abbrev_format;
  static const char_type zone_name_format;
  static const char_type zone_iso_format;
  static const char_type zone_iso_extended_format;
  static const char_type posix_zone_string_format;
  static const char_type duration_sign_negative_only;
  static const char_type duration_sign_always;
  static const char_type duration_seperator;
  static const char_type negative_sign;
  static const char_type positive_sign;
  static const char_type iso_time_format_specifier;
  static const char_type iso_time_format_extended_specifier;
  static const char_type default_time_format;
  static const char_type default_time_input_format;
  static const char_type default_time_duration_format;
};