I used to have the C date format in my system because it’s short date was dd-MMM-yyyy, or the output of the command date +"%d %b %Y", which would show today’s date as “14 Jul 2026”.
I loved this because it was the shortest format that’s impossible to be mistaken, even if you rearrange the date, month and year. In handwriting, it can also not be tampered without evidence. Thus, I believe this is superior short format that should be the standard.
But after recent updates now, I don’t know what happened, ALL of the formats seem to have changed to “14 07 2026”, or some variant of that. I guess sensibility and practicality is overrated 
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Anyway, those who are looking to fix the date format in your taskbar, you can do it from Right click the clock** > Configure Digital Clock > Appearance > Date format**. Select the format you like from the dropdown menu and click on Apply or Ok. If you prefer the format I mentioned (14 Jul 2026), you can set that by selecting Custom and enter the format dd MMM yyyy. You can also refer to the documentation linked below the input box.
And those who are looking to fix the date in the entire system, I don’t know how you can do that, or what you can do about it. Maybe complain in forums like me.
I hope this helped. If anyone knows which of the existing options in the settings have the date format as dd MMM yyyy or “14 Jul 2026”, please let me know.