month_format_spec month_format() ;

Describe month format -- its an integer in iso format.

const charT * not_a_date() ;

String used printed is date is invalid.

const charT * pos_infinity() ;

String used to for positive infinity value.

const charT * neg_infinity() ;

String used to for positive infinity value.

charT year_sep_char() ;

ISO char for a year -- used in durations.

charT month_sep_char() ;

ISO char for a month.

charT day_sep_char() ;

ISO char for a day.

charT hour_sep_char() ;

char for minute

charT minute_sep_char() ;

char for minute

charT second_sep_char() ;

char for second

charT period_start_char() ;

ISO char for a period.

charT time_start_char() ;

Used in time in mixed strings to set start of time.

charT week_start_char() ;

Used in mixed strings to identify start of a week number.

charT period_sep_char() ;

Separators for periods.

charT time_sep_char() ;

Separator for hh:mm:ss.

charT fractional_time_sep_char() ;

Preferred Separator for hh:mm:ss,decimal_fraction.

bool is_component_sep(charT sep) ;

bool is_fractional_time_sep(charT sep) ;

bool is_timezone_sep(charT sep) ;

charT element_sep_char() ;