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.

month_format_spec month_format() ;

Describe month format.

ymd_order_spec date_order() ;

bool has_date_sep_chars() ;

This format uses '-' to separate date elements.

charT year_sep_char() ;

Char to sep?

charT month_sep_char() ;

char between year-month

charT day_sep_char() ;

Char to separate month-day.

charT hour_sep_char() ;

char between date-hours

charT minute_sep_char() ;

char between hour and minute

charT second_sep_char() ;

char for second