Address Formating
To change the address format from the European default to i.e. the US format pick a locale format in the media campaign:
This will change from the default Address format
...
This address appears on the Cover Letter (on the Header, as well as in the table) as well as on the second page, under Contact Information. We support all locale which are also supported by Salesforce, for more information read: https://help.salesforce.com/articleView?id=admin_supported_locales.htm&language=en_US&type=0.
To choose which address gets populated into which row please read the 7.5.6 Configure Address Blocks and Contacts on PDF information.
Date Formating
The date in the top right corner of your PDF is always showing the city of the Media Campaign's owners / contacts city and todays date. The formating of the date is also depended on the locale.
Examples:
Hamburg, 2 Apr 2019
Hamburg, 2019-04-02