Currently Nintex Forms do not respect the users personal regional settings defined in their Sharepoint user profile for date and number fields. Nintex Forms are using the Sharepoint site collections regional settings. This results in different date and number formats for users in Sharepoint lists and Nintex forms if they have a setting different to the one on the Sharepoint site collection. For consistent behavior in Nintex based Sharepoint applications Nintex Forms should respect this user setting.