Date format is not working as per selected date format

Company - Long for hspl

Steps :
1)Login with sa
2)Customizer -> Partner -> Uk partner -> Date format selected -> YYYY/MM/DD
2)Company information -> Localization -> Date format selected as YYYY/MM/DD
3)Login with partner
4)Observe that for any page, system accepts date format in MM/DD/YYYY format only
5)Also observe that currency is also not changing as per saved changes

Expected Result : System must accept the date format as per selection.(YYYY/MM/DD) and must display currency according as per saved.

Please find attached screen shot