Comment by prima-facie

>> ISO date and time

Yes, but not always in my experience:

    # Default locale is en_GB.utf8
    
    > date  
    Fri  3 Jul 12:14:20 BST 2026
    
    > date +%x  
    03/07/26
    
    > LC_TIME="C.UTF-8" date   
    Fri Jul  3 12:14:29 BST 2026
    
    > LC_TIME="C.UTF-8" date +%x  
    07/03/26