Date/time - format variables - change to Unicode patterns

[user0]

XnViewMP 1.7.2
Windows11 (23H2), display resolution 3840x2160, dpi scale 150%

Date/time - formatting tokens
app mixes two date/time formatting styles:

• C-style single-letter codes (eg Y, m from strftime)
  efficient for scripting, but unintuitive for manual input

• Unicode Locale Data Markup Language (LDML) and Common Locale Data Repository (CLDR) repeating patterns (eg YYYY, MM)
  visually representative, easier to remember and align with the standards used in windows, office

Suggestion

date_time_patterns.png

• change date/time tokens to Unicode LDML patterns
  
  • maybe add more patterns
    - W/WW - week
    - t/tt - time marker (AM/PM)

Example

• windows
  windows_date_time.png

Related

• suggestions
  Date/time - format variables - change to Unicode patterns (current post)
  Rename - date/time - update templates
  - done -
  FTP - fix date format (1.9.9)
  settings - general - clean 'Duplicate files' combobox (1.8.1)
  Edit XMP - fix date format (1.6.0)