Correct ja-JP time format
Correct ja-JP time format

- The old format of date time `"%Y %b %e %a %X"` generates strings like `2020 3月 10 火 15:20:22`, which is not correct. The date part of them should be either `2020/03/10` using slashes as separators or `2020年3月10日` using 年 (year), 月 (month) and 日 (day) as suffixes. Using suffixes partly should be avoided.
- Month names are replaced with numeric notation with kanji suffix because these names are obsolete and mostly used for Chinese luni-solar calendar.
d3/d3-time-format