Fix

• Class mismatch in specification of argument legacy in convert_jdate() (#55).

New Features

• convert_prefecture(): New functions for converting prefecture names between Roman and Kanji (@Doubt-0KB, #48).
• convert_prefecture_from_kana(): New functions for converting prefecture names from kana to Kanji (@Doubt-0KB, #48).

Enhancement

• Re-factoring convert_jyear() and convert_jdate() (@paithiov909, #50).

New Features

• kana(): New function for create kana vector (#43).
• harmonize_prefecture_name(): New function for processing prefectural strings (#37).
  • Determine if the string is a prefecture string by is_prefecture().
• str_jnormalize: New function for pre-processing Japanese characters following the rules of 'neologd' (@paithiov909, #36).

Fix

• Fix the behaviors of jholiday_spec() when any NAs, NULL, and empty strings are supplied (@paithiov909, #38).
• is_jholiday() fails if the date argument contains NA (@hidekoji, #39).
• is_jholiday() returns incorrect result if lubridate.week.start option is set to other than Sunday (@hidekoji, #40).

Enhancement

• jholiday_spec() is now memoised internally. This change makes its second and later calls faster. Also, multiple values of name are now acceptable. (@paithiov909, #38).

Fix

• Determination of substitute holidays due to forgetting to update raw data (#31).

New Features

• Added functions to convert Kansuji to Arabic numbers (@indenkun #23).
  • kansuji2arabic_num() converts Kansuji that containing kansuji for positions (e.g. Hyaku, Sen, etc) to Arabic numerals with the numbers represented by Kansuji (Fix #8).
  • kansuji2arabic_str() converts Kansuji in the string to Arabic numerals with the numbers they represent.
• Added functions to graph labels to handle Kansuji (@indenkun #4).
  • label_kansuji() and label_kansuji_suffix() converts the label value to either Kansuji value or mixture of Arabic numerals and the Kansuji Scales.

Enhancement

• Holiday determination now reflects the 2021 calendar (@zettsu-t #28).
• convert_jyear() supports strict representation of the Japanese imperial year (#30).

New Features

• convert_jdate() can converts the Japanese date format to as a date object.

Enhancement

• find_date_by_wday(), jholiday_spec(), jholiday(), and is_jholiday()
  are now vectorized and accept multiple years (@yutannihilation, #15).
• separate_address() also now vectorized.

• Added several functions to handle postal code data.
  • read_zipcode() to read Japan post's zip-code file and dl_zipcode_file() for raw file download.
  • is_zipcode() test zip-code. Only supports 7-digit numbers or characters.
  • zipcode_spacer() insert and remove zip-code connect character.
• str_jconv() and str_conv_*() converts the kind of string used as Japanese people.
• Added some functions related to Japanese holidays.
  • jholiday_spec() to find date from corresponding year and holiday name and jholiday() is used to look up a list of holidays for the year.
  • is_jholiday() whether the day is a holiday.
• Find out the date of the specific month and weekday (find_date_by_wday())

• Added a NEWS.md file to track changes to the package.