enhancement: update default time format in zh-cn.yml and zh-tw.yml

[MBRjun]

• In China, the time format used by most people is YYYY/MM/DD(YYYY 年 MM 月 DD 日).

Related issues:

Changes

Update default time format(MMM DD, YYYY -> YYYY 年 M 月 D 日)

• before
  

• after
  

Testing guide

Checklist

• I checked the code style with npm run lint
• I updated the README or the documentation
• I tested my changes with the current recommended Node LTS version: 16.14.1
• I tested my changes on all desktop browsers listed below (with their latest versions):
  • Chrome, Firefox and Opera
  • Safari
  • Edge
  • IE 10+
• I tested my changes on all mobile browsers listed below (with their latest versions):
  • Chrome, Firefox and Opera
  • Safari
  • Edge

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This change is 

[LouisBarranqueiro]

👋 @MBRjun, I don't know these languages. What are the motivations for these changes? Getting close to a standard? Could you please share some documentation so I can understand these changes?

[MBRjun]

Yes, it's getting close to a standard and more common in China.

The Chinese date format follows the Chinese hierarchical system, which has traditionally been big-endian. Consequently, it correlates with ISO 8601 — year first, month next, and day last (e.g. 2006-01-29). A leading zero is optional in practice, but is mostly not used. Chinese characters that mean year, month, and day are often used as separators (e.g. 2006年1月29日). Since the characters clearly label the date, the year may be abbreviated to two digits when this format is used.

some docs:

• 数据元和交换格式 信息交换 日期和时间表示法 (Data elements and interchange formats -- Information interchange -- Representation of dates and times) (GB/T 7408-94) - 中华人民共和国国家标准
• 采用公历标示日期的规范（试行） (Standards for Marking Dates Using the Gregorian Calendar (Trial Implementation)) (ZC 0010-2006) - 国家市场监督管理总局规章
• Date and time notation in Asia - WikiPedia

[LouisBarranqueiro]

Thanks @MBRjun for the details and your help! 🙌

[LouisBarranqueiro]

code LGTM