choose_dmy_format       Get TRUE if date format is dmy
choose_dym_format       Get TRUE if date format is dym
choose_mdy_format       Get TRUE if date format is mdy
choose_myd_format       Get TRUE if date format is myd
choose_ydm_format       Get TRUE if date format is ydm
choose_ymd_format       Get TRUE if date format is ymd
dfiso                   Function recognize date variables and modify
                        them to ISO standard ("International
                        Organization for Standardization")
find_dmy_date_format    Find DMY dates only
find_dym_date_format    Find DYM dates only
find_mdy_date_format    Find MDY dates only
find_myd_date_format    Find MYD dates only
find_only_dates         Return TRUE if data frame column or vector
                        contains date
find_unknow_date        Find Unknown date, defined as UN or UNK
find_ydm_date_format    Find YDM dates only
find_ymd_date_format    Find YMD dates only
get_abbreviated_month_name
                        Replace full month name by abbreviated month
                        name
get_full_name_months_sep_by_vertical_bar
                        Get vector with full name of months separated
                        by vertical bar
get_max_score_within_data_formats
                        Score each of date format ymd, ydm, dmy, dym,
                        mdy, myd and return only the highest score
get_months              List month names: full names and abbreviated
                        names in lower case
get_months_full_names   List month names: full names in lower case
get_months_sep_by_vertical_bar
                        Get vector with full and abbreviated name of
                        months separated by vertical bar
get_number_of_symbols_in_string
                        Function to find number of symbols in date
get_up_to_12_char       function return observations with up to 12
                        characters
has_dash_or_slash_or_white_space_characters_or_months_separated_by_vertical_bar
                        Function return special characters and months
                        separated by vertical bars
has_dash_or_slash_or_white_space_characters_separated_by_vertical_bar
                        Function return special characters separated by
                        vertical bars
prepare_date            Additional step for YMD date type
remove_no_date_characters
                        Function remove symbols
remove_unnecessary_part_of_date
                        Get substring of date to eliminate unnecessary
                        part
viso                    transform date vector to date vector in ISO
                        standard ("International Organization for
                        Standardization")
