I want to change the default date format like
mm/dd/yy to dd/mm/yy for
en_us locale in admin as well as front-end.
Don't want to change the locale for that.
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To change visible date format in date inputs You need to set proper Interface Locale in the Account Setting.
After that You will see changes on the Edit Product Page.
To change dates in frontend catalog go to: Stores > Configuration > Catalog > Catalog and find Date & Time Custom Options
There you can configure date format on store front catalog.