This remains an unresolved problem as reported year after year:
2017 Use system locale for date and time format
2016 Respct time format set in system settings
2015 [Wishlist] Date and time format
The correct date formats do not appear for my region. Using the second day of April this year as an example:
d MMM e.g. 2 Apr
d MMMM e.g. 2 April
d/m/y e.g. 2/4/19
dd/mm/yy e.g. 02/04/19
My Settings
Windows 10 Settings | Time & Language | Date & Time:

Windows 10 Settings | Time & Language | Region
Windows 10 Settings | Time & Language | Region | Change data formats
GlassWire Settings | General:
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GlassWire ignores the system date format
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