for the login, I'll need to troubleshoot directly, see the private message section.
For the View in browser and unsubscribe login issue, that is not a supported modification, we could help with this in a premiere support appointment:
the date format in the emails is taken from the server, you would need to edit the php.ini file to the set the date_timezone of the server to time zone you would like to use in the email.
Your other questions, I dont understand. please provide more details.