Backend module
The backend module shows a list with filters. The date format of the input fields of the filter can be adapted by overwriting the following TypoScript.
        EXT:cart/Configuration/TypoScript/constants.typoscript
    
plugin.tx_cart {
    settings {
        backend {
           dateFormat = Y-m-d
        }
    }
}        
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plugin.tx_cart.settings.search
dateFormat
- 
                        - Type
- 
            
    string 
- Default
- 
            
    Y-m-d 
 Defines the format which will be shown after using the filters in the backend. See also the PHP documentation.